Laboratory Skills Guide: Key Techniques and Best Practices

Strengthen Your Day-to-day Lab Skills for Precise Measurements and Safe Operations

Basic Laboratory Skills form the foundation of quality laboratory work.

A balance placed near a vibration source. A pipette that hasn't been checked for accuracy. An electrode that wasn't properly calibrated. A sample exposed to humidity for a few extra minutes. These seem like minor oversights, easy to miss! But in the laboratory, these small details can significantly affect the quality, consistency, and accuracy of measurement results. Measurement results in the laboratory are only as reliable as the techniques behind them.

The Laboratory Skills Guide is designed to help both students and laboratory professionals strengthen their core measurement skills. Whether working in pharmaceuticals, chemicals, food and beverage, environmental testing, academic research, or quality control, measurement accuracy starts with strong fundamentals.

From weighing and pipetting to pH measurements, titration, spectroscopy, moisture determination, density measurement, thermal analysis, and more, this guide focuses on everyday measurement processes. It brings together the best practices to improve accuracy, avoid common errors, and select the right tools for reliable results.

Start exploring the techniques below.

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Essential Laboratory Measurement Techniques

Sample Preparation and Routine Testing

From sample preparation to final analysis, essential laboratory techniques are at the heart of everyday laboratory operations. They encompass the methods used to measure, manipulate, and characterize substances, helping to ensure that procedures are performed consistently across different users, instruments, and environments. These foundational techniques support a wide range of scientific applications and serve as the basis for more advanced analytical and research methodologies.

The following section introduces the essential laboratory techniques used across scientific and industrial environments. It provides an overview of the principles, applications, and key considerations behind each method, helping users understand not only how measurements are performed but also how to achieve accuracy, consistency, and reproducibility.

.Scientist pipetting samples at laboratory

Laboratory Weighing

Laboratory weighing is a fundamental technique used in various scientific fields to measure the mass of substances with high precision. The main applications of laboratory weighing include:

Dispensing and Filling

Efficiently weigh solids and liquids for dispensing, filling, and batching applications. From laboratory sample handling to manufacturing operations, achieve accurate dosing, improve process efficiency, and ensure consistent results across a wide range of materials.

Sample and Solution Preparation

Support the preparation of samples, standards, buffers, cultures, media, and formulations while ensuring accurate concentrations, process consistency, and reliable outcomes from research through production.

Advanced Analytical and Process Applications

Streamline processes involving differential weighing, moisture analysis, NVR testing, filter weighing, fire assay, density determination, SQC, piece counting, and other quality-critical testing procedures.

Tips and Tricks for Reliable Results

To achieve accurate and reliable results in laboratory weighing, consider the following tips and tricks:

Installation: Ensure professional installation and setup of your instrument from the start.
Leveling the balance: Always check and adjust the balance to ensure it is perfectly level before use.
Calibration: Get your balance calibrated regularly by an accredited service technician.
Handling samples: Use clean, dry containers to hold samples. Avoid touching samples with bare hands.
Environmental conditions: Maintain consistent temperature and humidity in the weighing area. If necessary, use anti-static devices to reduce static electricity.
Draft shield: Utilize the draft shield to protect the balance from air currents.
Routine maintenance: Clean the balance with a soft brush and lint-free cloth. Avoid using harsh chemicals that could damage the balance.
Learn more about weighing tips.

Pipetting

Pipetting is an essential technique in various scientific fields, including biology, chemistry, and clinical research. Accurate pipetting is crucial for ensuring reproducibility and reliability in experiments, making it a vital skill for laboratory personnel.

Biological and Biomedical Applications

Cell culture: Media preparation and cell transfer
Molecular biology: PCR and cloning
Diagnostic testing: Blood and pathogen tests
Drug development: Formulation and dose response studies

Environmental and Analytical Applications

Environmental testing: Analyzes pollutants in water, soil, and air
Analytical chemistry: Critical for titrations and assays
Quality control: Prepares standards for consistency and safety Research and Development Applications

Research and Development Applications

Forensic analysis: Prepares DNA and toxicology samples
High-throughput screening: Screens multiple samples in research
Laboratory protocols: Essential for ELISA and enzyme assays

Tips and Tricks for Reliable Results

Proper pipetting technique is crucial for accuracy and precision in laboratory work. Here are some essential tips and tricks to enhance your pipetting skills:

Good pipetting practices: Maintain the pipette tip at a near-90-degree angle to the liquid surface during aspiration. Avoid submerging the tip to prevent excess liquid adhesion.
Calibration checks: Perform regular checks to confirm the accuracy of your pipette. If the results do not fulfill specifications, send the pipette for calibration.
Tip selection: Ensure that pipette tips are compatible and properly fitted to the pipette to prevent leakage and inaccuracies.
Liquid properties: Viscosity and density can affect uptake and delivery.
Maintenance: Store pipettes in a vertical position and periodically check for wear on seals and tips.
Learn more about Good Pipetting Practice.

pH and Conductivity

pH and conductivity measurements provide insights into the chemical properties of solutions. pH indicates acidity or alkalinity, while conductivity measures how well a solution conducts electric current, reflecting ion concentrations. They have various applications in laboratories.

Quality Control

In pharmaceuticals and food processing, maintaining specific pH levels helps ensure product safety and efficacy
Conductivity monitoring is vital for verifying stable ionic concentrations in formulations

Environmental Monitoring

pH and conductivity are key indicators of water quality
Measuring pH helps assess the impact of pollutants on aquatic life
Conductivity indicates dissolved salts, pointing to potential contamination sources

Research and Development

In fields like biochemistry and microbiology, pH influences enzyme activity and microbial metabolism
Conductivity measurements inform about chemical reactions and material characterization

illustration: ensure accurate pH and conductivity measurements

Tips and Tricks for Reliable Results

To ensure accurate pH and conductivity measurements, follow these tips and tricks:

Installation: Place your instrument in a stable environment, away from direct sunlight.
Calibration: Perform calibrations daily or before each series of measurements, using fresh calibration standards that bracket the measurement range.
Electrode maintenance: Follow strict cleaning and maintenance protocols to optimize electrode performance.
Temperature compensation: Use meters with automatic temperature compensation (ATC) to ensure accurate readings under varying temperature conditions.
Sample handling: Always mix samples to ensure homogeneity before taking measurements. Avoid air bubbles in the sample, as they can affect conductivity readings.
Documentation: Record measurements, relevant environmental conditions, calibration dates, and maintenance logs.

Learn more about Good Electrochemistry Practice.

Titration

Titration is a frequently performed analytical chemistry technique, employing chemical reactions to quantitate substances of interest. Detection methods mainly include changes in color, pH, electrical potential, turbidity, and the evolution of heat during the reaction.

Food Industry

Acid content: Titration measures acid content in foods (e.g., juices, wines) to ensure flavor and stability
Salt content: Assesses sodium chloride in processed foods for flavor and compliance
Protein levels: Evaluates protein in cheese and meats for labeling and quality
Nutrients: Measures vitamins like C for labeling and quality assurance

Pharmaceuticals

Active ingredients: Titration measures the content of APIs for correct potency
Quality control: Verifies purity in materials and products
Assay procedures: Evaluates purity and concentration of weak acids/bases
Buffer capacity: Assesses buffer capacity for drug formulation stability
pKa: pKa determination by titration is routine in pre-clinical tests

Chemicals

Content determination: Titration accurately measures unknown solution content for formulation
Acid-base reactions: Determines pH and acidity/alkalinity
Redox reactions: Analyzes oxidation-reduction potential
Complexometric reactions: Measures metal ion content
Purity testing: Assesses chemical purity
Quality control: Verifies ingredient content for consistency and compliance

illustration: ensure accurate and reliable titration measurements

Tips and Tricks for Reliable Results

To ensure accurate and reliable titration measurements in the laboratory, it is crucial to adhere to the following best practices:

Burette: Select the sample size to achieve a titrant consumption of 20–80% burette volume for accurate results. Standardize your titrant for accuracy and verify with traceable standards.
Beaker: Use clean beakers and stir vigorously. Ensure complete dissolution before titration. Rinse the stirrer and electrode after each sample titration, conditioning for 30–60 seconds in a suitable solvent.
Sensor: Immerse the sensor properly, ensuring the junction of pH electrodes is submerged. Calibrate according to SOPs and when performing acid-based titrations. Condition sensors before using, particularly when using ion selective electrodes (ISEs), or when performing acid/base titrations in non-aqueous solvents with pH electrodes. Maintain them regularly per Good Titration Practice™ (GTP®).

Learn more about Good Titration Practice.

UV/Vis Spectroscopy

UV/Vis spectroscopy measures the absorption of UV and visible light by substances, allowing the determination of properties like concentration and composition. This nondestructive technique offers rapid, accurate analytical data, making it essential in pharmaceuticals, environmental monitoring, and food testing. Some of the UV/Vis applications are as below:

Concentration Determination / Quantitative Analysis

UV/Vis spectroscopy is commonly used to determine analyte concentrations in solutions. This application is vital in pharmaceuticals for drug formulation, environmental monitoring for pollutant detection, and life sciences for analyzing nucleic acids, proteins, and bacterial cultures.

Qualitative Analysis

UV/Vis spectroscopy identifies substances by their unique absorption spectra, acting as a “fingerprint.” This is invaluable for quality assurance in food and beverage testing and for ensuring product consistency in chemical manufacturing.

Kinetic Studies

The technique monitors chemical reactions by measuring absorbance changes at specific wavelengths, making it essential for biotechnology and chemical research applications.

illustration: ensure the optimal performance of UV/Vis spectrophotometers

Tips and Tricks for Reliable Results

To ensure the optimal performance of UV/Vis spectrophotometers, it is crucial to maintain clean working environments and handle samples with care:

Cuvette selection: Use appropriate cuvettes based on samples. Standard plastic cuvettes work for aqueous solutions, but quartz cuvettes are necessary for UV measurements due to better light transmission. Ensure cuvettes are clean and scratch-free.
Consistent path length: Maintain a consistent cuvette path length for all samples, as variations can lead to inaccurate readings. Always use cuvettes with the same path length for comparisons.
Blanking the instrument: Perform a blank measurement with the solvent to zero the instrument and account for background absorbance, ensuring accurate readings.
Temperature control: For temperature sensitive samples, use a temperature-controlled environment, as fluctuations can affect absorbance and results.
Documentation: Keep detailed records of settings, conditions, and sample preparations for troubleshooting, replicating experiments, and compliance with lab standards.
Learn more about UV/Vis spectroscopy measurements.

Cell Counting

Cell counting determines the concentration and viability of cells in a suspension. CytoDirect replaces manual, stain-based counting with a stain-free, automated method, preserving sample integrity and removing operator-to-operator variability.

Biopharma and Bioprocessing

Monitors viable cell density during upstream production to support process control
Supports batch-to-batch consistency
Stain-free operation avoids cytotoxicity bias in live cultures

Cell and Gene Therapy

Supports cell line development and characterization
Suits limited sample volumes typical of these workflows
Delivers reproducible counts for regulatory documentation

Academic and Research Labs

Speeds up routine cell culture maintenance
Reduces hands-on time spent at the microscope
Standardizes counting across users and experiments

Tips and Tricks to Achieve Better Results

To ensure accurate and reliable cell counts with CytoDirect, follow these best practices:

Cell density: Keep the cell suspension within the CytoDirect operating range of 10⁴–10⁷ cells/mL. Suspensions outside this range compromise detection reliability.
Cell dissociation: Thoroughly resuspend and trypsinize your cells to break up aggregates before counting.
Slide handling: Fill each sample slide with the recommended 20 µL of cell suspension. Avoid overfilling and keep the suspension within the designated sample area to prevent contamination and inaccurate reads.
Cleaning: Clean the sensor regularly with the dedicated cleaning swabs to maintain measurement consistency.
Verification: Use the Performance Verification Kit to verify the counting accuracy of CytoDirect at defined intervals.

Learn more about cell counting.

Moisture and Water Content

Moisture and water analysis are crucial in laboratories, especially in the food, pharmaceutical, and chemical sectors, where they impact product quality and shelf life. It is essential to differentiate between moisture content (all volatile compounds) and water content (specific to water).

Food Industry

Moisture content is vital for ensuring the safety, quality, and shelf life of food products
It affects taste, consistency, and preservation
It influences product formulation and quality
Accurate measurements prevent spoilage and enhance consumer satisfaction

Pharmaceuticals

Moisture content significantly affects the efficacy and stability of active pharmaceutical ingredients (APIs)
It influences drug solubility and bioavailability
Accurate moisture analysis is essential to maintaining regulatory compliance and ensuring product safety

Chemicals

Moisture content affects chemical reactions and product characteristics
High moisture causes degradation or unwanted reactions
Low moisture impacts flowability and handling
Optimal moisture levels are crucial for product integrity and compliance with industry standards

illustration: ensure accurate and reliable moisture and water content

Tips and Tricks for Reliable Results

To ensure accurate and reliable moisture and water content measurements in the laboratory, it is crucial to adhere to the following best practices:

Environmental control: Maintain a stable temperature and humidity level in the laboratory, as fluctuations can affect moisture measurements.
Sample handling: Prepare samples in a controlled environment, using airtight containers to prevent moisture loss or absorption.
Sample size: Use consistent sample sizes for all measurements to ensure comparability and reduce variability in results.
Calibration and testing: Regular testing with a certified SmartCal testing substance is essential for moisture analyzers. For Karl Fischer titration, monitor instruments at intervals to ensure consistent results.
Routine maintenance: Keep instruments clean and serviced regularly to prevent cross-contamination and ensure optimal performance.
Learn more about water and moisture content determination techniques.

Density

Density measurements assess the purity and concentration of samples, providing insights into their composition. Digital density meters have largely replaced manual methods, such as hydrometers, and are essential in industries such as pharmaceuticals, chemicals, food and beverage.

Pharmaceuticals

Density measurements are essential in the pharmaceutical industry for ensuring product purity and concentration, which guarantee consistent quality. They also optimize formulations and are crucial for regulatory compliance and quality assurance, ensuring adherence to industry standards.

Chemicals

Density measurement is vital for ensuring the consistency of raw materials and final products. It helps assess and adjust solution concentrations, aiding in the accurate mixing of chemicals, fuels, solvents, and fragrances. Additionally, it ensures compliance with industry standards and environmental regulations.

Food Industry

Density measurement is crucial for consistency in formulations, ensuring each product batch has the desired texture and flavor. It plays a key role in fermentation, mixing, and dilution in beverage production. Accurate density measurements are also essential for labeling nutritional information, including the final alcohol content in wines and spirits.

Tips and Tricks for Reliable Results

To achieve accurate and reliable density measurements, it is important to follow a few key best practices and avoid common sources of error:

Sampling: Ensure the measuring cell is filled with test substances, avoiding air bubbles and impurities. Use slow, laminar flow for loading, and consider automatic filling systems for consistency. METTLER TOLEDO Excellence Density Meters provide a live video view of the measuring cell to monitor bubbles, which are recorded with the measured data. The built-in Bubble Check™ automatically detects bubbles.
Cleaning: Improper cleaning is a common source of inaccurate results. Before cleaning the measuring cell, remove the previous sample. Start with a thorough first rinse using a low-volatility solvent to eliminate contamination. Follow with a second solvent rinse that dissolves the first solvent and evaporates quickly, leaving no residue for efficient drying.
Learn more about density measurement.

Refractive Index

Refractometry is an analytical method that measures a sample’s refractive index to determine its composition and purity.

Pharmaceuticals

This technique is vital in the pharmaceutical sector for accurately assessing substance concentrations, ensuring drug efficacy and safety. It aids in quality control of compounds like hydrogen peroxide and methanol, and is crucial for regulatory compliance, enhancing overall product quality.

Chemicals

Refractive index measurements are essential in the chemical industry for assessing purity and concentration, ensuring product quality and consistency. They aid in substance identification, optimize manufacturing processes, and help meet regulatory standards, enhance efficiency, and maintain high-quality products.

Food Industry

Converting refractive index into scales like Brix (sugar content) or Oechsle allows assessment of product quality and consistency in soft drinks and grape must. Advanced refractometers provide precise measurements, enhancing flavor profiles and optimizing production processes for improved efficiency.

Tips and Tricks for Reliable Results

Following these best practices is essential to achieving accurate and reliable refractive index measurements in the laboratory:

Sampling: Apply the sample directly to the prism using a pipette. For viscous substances, stir to eliminate air pockets for a uniform sample; a few drops are enough.
Measuring: Ensure the sample is at the set temperature (e.g., 20 °C) before measuring. Automatic refractometers provide results in the desired units (nD, Brix, etc.) and often include quality control to compare results against set limits, showing pass or fail outcomes.
Cleaning: Clean and dry the prism before and after measurements to avoid residue and cross-contamination. Use a solvent for the cell and a marked “waste syringe” for easy sample removal, conserving lab tissue.
Learn more about refractive index measurement.

Melting Point

Melting point analysis is crucial in various fields for quality control of raw materials and finished products, especially in the pharmaceutical and chemical industries. It is key for qualitative analysis and assessing the purity of chemical substances.

Pharmaceuticals

The melting point is a quality control measure for active pharmaceutical ingredients (APIs), raw materials, and chemicals. Automated detection reduces errors and ensures data integrity, confirming product purity and compliance with monographs.

Chemicals

In the chemical industry, melting point ensures correct product traits during synthesis. Boiling point, measurable by melting point devices, quality-controls organic solvents using minimal solvent and enhancing safety. Cloud point, also measurable, is used in detergent quality control.

Food and Beverage

The Slip Melting Point is another parameter that can be measured using a melting point device and is commonly found in the food industry. It is utilized for non-crystalline substances, often oily in nature, and is extensively applied as a quality control measure in the animal and vegetable oil industries.

Tips and Tricks for Reliable Results

To achieve precise and reliable melting point measurements in the laboratory, it is essential to follow these best practices:

Sample: For colored or decomposing samples, a lower threshold may be needed. Seal capillaries for volatile and hygroscopic samples. Ensure all samples are dry, homogeneous, and powdered. Fill capillaries to the same height and compact for consistency.
Heating rate: Typical heating rates are 1 °C/min, and 10 °C/min for exploratory measurements.
Start/end temperature: Start 3-5 °C below the expected melting point and end about 3-5 °C above it for accurate measurement.
Capillaries: Use melting point capillaries, like those from METTLER TOLEDO, for accurate results. If using different capillaries, calibrate and adjust the instruments as needed.
Learn more about melting point analysis.

illustration: achieve precise and reliable melting point measurements in the laboratory

Dropping Point

Dropping and softening point determination are simple methods to characterize materials that gradually soften as the temperature rises and melt over a relatively large temperature interval.

Cosmetics

The dropping point is employed to ensure that lipsticks are soft when applied. It is also used in the quality control of creams, fluids, and other oil-based cosmetics. Additionally, waxes are commonly analyzed using this method to ensure consistency and the reliability of the production process.

Chemicals

The dropping point is a crucial parameter in the automotive industry, serving as a key quality indicator for grease quality control. Additionally, the softening point, which can also be measured using a dropping point device, is utilized in bitumen analysis. Furthermore, this technique is widely employed in the analysis of resins and rosins.

Food and Beverage

The animal and vegetable oil industry utilizes the dropping point as a quality checkpoint. The device can also be used to analyze chocolate. The softening point serves as an important indicator of cheese quality, as different types and ingredients with varying ratios will cause them to soften at different temperatures.

illustration: accurate and reliable dropping point measurements in the laboratory

Tips and Tricks for Reliable Results

For accurate and reliable dropping point measurements in the laboratory, it is crucial to adhere to these best practices:

Sample: For powder samples, make sure that the sample is dry, well compact the sample, and fill the cup with the sample. For samples that require remelting, make sure that there are no air bubbles, once poured into the cups, wait till solidification occurs.
Heating rate: Dropping point is highly heating rate dependent, for the best results use the heating rates between 1 and 2 °C/min. For exploratory measurement, use 10 °C/min.
Start/end temperature: If you are measuring according to the norm, refer to its method requirements. Start 3–5 minutes before or 5–10 °C below the expected dropping/softening point, and end about 5 °C above it for accurate measurements.
Cups: Use aluminum (single use) or steel (multiple use) cups, always refer to the standard for additional information on the cup type that should be used.
Learn more about dropping point.

Thermal Analysis

Thermal analysis studies how a material’s properties change with heating, cooling, or constant temperature. It employs specialized techniques to provide insights into heat capacity, melting behavior, and tensile strength. Additionally, it aids in substance identification and purity assessment.

Pharmaceuticals

Thermal properties of active pharmaceutical ingredients and excipients
Understand how different components interact thermally
Stability testing under various temperature conditions
Ensure that the properties of pharmaceutical products meet the standards

Chemicals

Thermal properties and stability assessment of chemicals
Monitor exothermic and endothermic reactions in chemical processes
Establish how various ingredients interact thermally
Ensure that the properties of chemical products meet the standards

Polymers

Characterization of polymers and plastics to understand their composition, stability, and degradation in various conditions
Thermal properties and stability assessment of polymers
Polymer properties influence processing and end use performance
Ensure that the properties of the polymer meet specified thermal and physical properties

Tips and Tricks for Reliable Results

The most important point before beginning an analysis is to be absolutely clear about the property you want to measure and the results you hope to get. Some of the best practices suggestions are below:

1. Defining the Property

Before starting an experiment, be absolutely clear about the property or effect you want to investigate (e.g., glass transition, melting, decomposition, viscoelastic behavior, thermal stability). This determines the technique, method parameters, and data interpretation.

2. Choose the Correct Technique

Use the technique that best matches the information needed. Selecting the wrong technique can lead to incomplete or misleading results:

DSC: Melting, crystallization, glass transition, reaction enthalpy, influence of additives
TGA: Composition, decomposition, moisture loss, thermal stability, filler content.
TMA: Dimensional changes, expansion, shrinkage, softening, glass transition
DMA: Viscoelastic properties, elastic modulus, damping behavior, glass transition

3. Optimize Sample Preparation and Crucible Selection

Proper sample preparation and choosing the appropriate crucible are critical to ensuring representative and reproducible measurements. These factors directly influence heat transfer, atmosphere interaction, and measurement quality.

4. Control Experimental Conditions and Validate the Method

Carefully define the temperature program, measurement atmosphere (air, nitrogen, oxygen, etc.), data evaluation approach, and method validation strategy. Reviewing and optimizing these parameters improves accuracy and repeatability.

Thermal Analysis Technique

	DSC	TGA	TMA	DMA
Glass transition	●		●	●
Melting, crystalization	●
Reaction entalphy and kinetics	●
Influences of addictive, fillers	●	○		○
Composition	○	●
Thermal stability /decomposition	○	●	○
Evaporation / desorption / vaporization	○	●
Filler content, content of reinforcing fibers	○	●
Expansion shrinkage			●
Viscoelastic behavior, elastic modulus			○	●
Damping behavior				●
Softening temperature			●	○

● Reccomended ○ Possible

Thermal analysis technique that can be used to measure a particular property depends on the effect or property you want to measure. The above table gives an overview on what is possible with each technique.

Learn more tips and tricks.

Choosing the Right Instruments and Techniques

Selecting the appropriate instruments and techniques is vital to achieving accurate and precise results in the laboratory. Below are some key factors to consider for different techniques:

1. Laboratory Weighing

Smallest net weight: Ensure it is above the minimum weight, with a safety factor applied.
Weighing tolerance: Determine how accurately you need to weigh the smallest sample and the acceptable variation.
Safety factor: Apply a safety factor to the minimum weight to account for environmental and operational variations.
Maximum capacity: Ensure the balance can handle the maximum load, including tare container.

Get the right balance with the free GWP Recommendation

2. Pipetting

Volume range: Ensure the pipette volume range matches your requirements.
Accuracy and precision: Select pipettes with a low coefficient of variation (CV) for critical applications, ensuring reliable results.
Ergonomics: Ergonomically designed pipettes reduce strain during extended use and provide a comfortable grip, improving user experience and accuracy.
Compatible tips: Compatibility is crucial for maintaining accuracy and avoiding liquid retention.
Calibration and maintenance: Opt for pipettes that are easy to calibrate and maintain.

3. pH and Conductivity

Accuracy and precision: Look for meters that offer high accuracy and precision.
Range: Select a sensor that covers the pH range you expect to measure in your samples.
Features: Consider additional features such as automatic temperature compensation.
Electrode compatibility: Choose electrodes that match the type of sample you expect to measure, along with a compatible meter.
Portability: If measurements need to be conducted in the field, look for portable meters that are robust and battery-operated.

4. UV/Vis Spectroscopy

Sample type and volume: Choose based on whether the sample is liquid or translucent and the required volume (µL or mL).
Wavelength range: Ensure the instrument covers the necessary UV and visible ranges.
Sensitivity and detection limits: Select an instrument with the right sensitivity for your analyte concentrations.
Automation capabilities: Consider features for sample handling, maintenance, and data collection to enhance efficiency.
Software and data analysis: Look for user-friendly software with strong data analysis and reporting capabilities.
Cost and maintenance: Evaluate total costs, including maintenance and support options.

Learn about the UV/Vis Risk Check

scientist working in a lab on UV/Vis Spectroscopy

5. Cell Counting

Cell line and morphology: The machine learning model is trained across a range of cell lines. Confirm compatibility for unusual morphologies.
Regulatory environment: For GMP-regulated environments, connect to LabX™ software for user management, full data traceability, and 21 CFR Part 11 compliance.
Throughput needs: A single measurement takes about 15 seconds, well suited to frequent in-process checks.
Portability requirements: Consider whether counting needs to happen at the bench, under a laminar flow hood, or directly at the production line.

6. Moisture and Water Content

Sample characteristics: Consider the physical and chemical properties of the samples to determine the best measurement technique, whether gravimetric, chemical, or physical, and select the instrument accordingly.
Method requirements: Choose instruments based on speed and throughput needs. For example, moisture analyzers and Karl Fischer titration provide fast results for water or moisture content determination.
Regulatory compliance: Ensure that the chosen instruments meet industry standards and regulatory requirements, particularly in pharmaceuticals and food safety.

Learn about Good Moisture Analysis Practice.

Female scientist working on moisture and water content

7. Titration

Sample characteristics: Consider the physical and chemical properties to choose the best measurement technique.
Chemical reaction: Select sensors based on the reaction type; use pH sensors for acid-base titrations and redox sensors for oxidation-reduction titrations.
Sample preparation: Analyze liquid samples directly or after dilution; solid or viscous samples may require processing methods like resuspension, milling, or digestion. Consistent procedures are crucial to minimize errors. METTLER TOLEDO’s SmartSample aids in sample tracking during titration.

Female scientist working with a titrator

8. Density

Sample type: The physical and chemical properties of the sample (solid, liquid, gas) can dictate the most suitable density measurement technique.
Measurement range: Different methods may have varying ranges of density that they can accurately measure.
Required accuracy and precision: The level of accuracy and precision needed for your analysis may determine the method used.
Temperature and pressure conditions: Some methods may be sensitive to changes in temperature and pressure, which can affect density readings.
Regulatory compliance: Ensure that the chosen instruments meet industry standards and regulatory requirements.

9. Refractive Index

Type of sample: The physical state (solid, liquid, gas) and the nature of the material (homogeneous or heterogeneous) can affect the choice of method.
Wavelength of light: Different methods may be more suitable for specific wavelengths, depending on the optical properties of the sample.
Temperature: The refractive index can change with temperature, so the measurement conditions must be controlled.
Purity of the sample: Impurities can alter the refractive index, so the sample purity should be considered.
Sample size: Some methods require larger samples, while others can work with very small amounts of material.

10. Melting Point

Sample type: Sample properties, like color, decomposition, or hygroscopicity, can influence the choice of method.
Purity of the sample: Impurities can lower the melting point or broaden the melting range.
Sample size: The sample height should be always around 3 mm. The height can be checked in compacting tool.
Instrument calibration: The equipment used must be well-calibrated for the specific sample types and temperatures to ensure reliable measurements.
Heating rate: The rate at which the temperature is increased can affect the melting point results.

11. Dropping Point

Sample type: Sample properties, like color, decomposition, or hygroscopicity, can influence the choice of method.
Sample size: Make sure that the cups are fully filled with the sample.
Instrument calibration: The equipment used must be well-calibrated for the specific sample types and temperatures to ensure reliable measurements.
Heating rate: The rate at which the temperature is increased can affect the melting point results; slower heating rates generally provide more accurate result.

12. Thermal Analysis

Sample type: Choose an instrument that is optimized for your sample type and expected thermal behavior.
Technique: Select the technique based on your analytical goal: TGA for composition and thermal stability, DSC for thermal transitions and reaction kinetics, TMA for dimensional changes, and DMA for viscoelastic properties.
Temperature: Ensure the instrument supports the required temperature range, atmosphere control, and heating/cooling programs for your application.
Software: Select the STARe software options that support your needs, such as compliance, LIMS connectivity, automated evaluations, quality control monitoring, automated reporting, reference libraries, etc.

Maintaining Data Integrity

In modern laboratories, software plays a vital role in ensuring data integrity and efficient management. By leveraging automation, labs can enhance accuracy and compliance in their scientific processes. Learn more about our software essentials:

Laboratory Software Solutions

Comprehensive software tools enable seamless data acquisition, analysis, and reporting, helping customers achieve faster and more accurate results.

Laboratory Software Solutions

Comprehensive software tools enable seamless data acquisition, analysis, and reporting, helping customers achieve faster and more accurate results.

Data Integrity

Ensuring data integrity is essential for credible research and compliance. Reliable software prevents errors and data loss, fostering trust and informed decision-making.

Data Management

Data management tools streamline the organization and retrieval of laboratory data, helping customers maintain structured datasets that enhance collaboration and ensure regulatory compliance.

Automation Solutions

Advanced automation technologies reduce manual intervention, minimize errors, and improve reproducibility, enabling customers to optimize workflows and allocate resources more effectively.

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Dropping and softening point measuring solutions

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Expert Advice

If you have questions about laboratory fundamentals, measurement processes, or instrument selection and operation, we're here to help. Reach out to our team for expert guidance and support.

FAQs

What's the difference between an analytical balance and a precision balance?

Precision balances offer readability up to 1 mg for general lab use; analytical balances offer readability up to 0.1 mg for high-precision quantitative work; microbalances go down to 0.001 mg for ultra-small samples.

How do I choose the right pipette for my application?

Match volume range to your needs, check accuracy/precision (low CV), consider ergonomics, tip compatibility, and how easy the pipette is to calibrate and maintain.

What's the difference between moisture content and water content, and which method should I use?

Moisture content covers all volatile compounds; water content is specific to water. Moisture analyzers give fast results (2–20 min), Karl Fischer titration is best for high accuracy at low water levels, TGA links moisture to thermal degradation, and drying ovens suit larger sample volumes.

What causes inaccurate UV/Vis spectroscopy or titration results, and how can I prevent them

For UV/Vis — wrong cuvette type, inconsistent path length, skipping the blank measurement. For titration — poor sensor immersion/calibration, incomplete dissolution, wrong titrant-to-sample ratio (aim for 20–80% burette volume).

Which thermal analysis technique (DSC, TGA, TMA, or DMA) should I use to measure a specific material property?

DSC for melting/crystallization and reaction enthalpy; TGA for composition and thermal stability/decomposition; TMA for expansion/shrinkage and softening temperature; DMA for viscoelastic behaviour and damping.

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Laboratory Skills Guide: Key Techniques and Best Practices

Strengthen Your Day-to-day Lab Skills for Precise Measurements and Safe Operations

Strengthen Your Day-to-day Lab Skills for Precise Measurements and Safe Operations

Essential Laboratory Measurement Techniques

Sample Preparation and Routine Testing

Laboratory Weighing

Dispensing and Filling

Sample and Solution Preparation

Advanced Analytical and Process Applications

Tips and Tricks for Reliable Results

Pipetting

Biological and Biomedical Applications

Environmental and Analytical Applications

Research and Development Applications

Tips and Tricks for Reliable Results

pH and Conductivity

Quality Control

Environmental Monitoring

Research and Development

Tips and Tricks for Reliable Results

Titration

Food Industry

Pharmaceuticals

Chemicals

Tips and Tricks for Reliable Results

UV/Vis Spectroscopy

Concentration Determination / Quantitative Analysis

Qualitative Analysis

Kinetic Studies

Tips and Tricks for Reliable Results

Cell Counting

Biopharma and Bioprocessing

Cell and Gene Therapy

Academic and Research Labs

Tips and Tricks to Achieve Better Results

Moisture and Water Content

Food Industry

Pharmaceuticals

Chemicals

Tips and Tricks for Reliable Results

Density

Pharmaceuticals

Chemicals

Food Industry

Tips and Tricks for Reliable Results

Refractive Index

Pharmaceuticals

Chemicals

Food Industry

Tips and Tricks for Reliable Results

Melting Point

Pharmaceuticals

Chemicals

Food and Beverage

Tips and Tricks for Reliable Results

Dropping Point

Cosmetics

Chemicals

Food and Beverage

Tips and Tricks for Reliable Results

Thermal Analysis

Pharmaceuticals

Chemicals

Polymers

Tips and Tricks for Reliable Results

1. Defining the Property

2. Choose the Correct Technique

3. Optimize Sample Preparation and Crucible Selection

4. Control Experimental Conditions and Validate the Method

Thermal Analysis Technique

Choosing the Right Instruments and Techniques

1. Laboratory Weighing

2. Pipetting

3. pH and Conductivity

4. UV/Vis Spectroscopy

5. Cell Counting

6. Moisture and Water Content

7. Titration

8. Density