Refractometer, buy digital Benchtop & Portable Meters - METTLER TOLEDO

Refractometer

A wide range of benchtop and portable digital refractometers

 

Digital refractometer

METTLER TOLEDO’s wide range of benchtop and portable digital refractometers  measure refractive index and other related values, such as, Br...

METTLER TOLEDO’s wide range of benchtop and portable digital refractometers  measure refractive index and other related values, such as, Brix, invert sugar, HFCS42 or HFCS55 or other concentrations with high precision and a short measuring time.

Our portable refractometers provide automatic temperature compensation. They can be used in the lab or in the field, for instance for measuring Brix, Oechsle or the freezing point of ethylene glycol and propylene glycol/water mixtures .


Our benchtop refractometers have a built-in Peltier thermostat to accurately control the temperature so a water bath is not required. They can be connected to a density meter, spectrophotometer, pH meter, titrator or other instruments to measure several parameters simultaneously. Various automation units are available to further improve productivity.


Expertise
Our expertise is available on a dedicated website www.refractometry.com (easy to remember), with videos, animations, webinars and a variety of applications for food & beverage, pharmaceuticals, chemicals, and other industries.  Several workflow solutions show how to improve the accuracy of your measurement, avoid errors and increase the throughput. Download our free Refractive Index Measurement Guide to learn how to improve refractive index measurement with digital refractometers.


 
refractometer
Refractometers
portable refractometer
automated refractometry

Excellence Refractometers

Portable Refractometers

Automated Refractometry Measurement

Developed for a wide range of applications, Excellence Refractometers allow for workflow automation and can be expanded to multiparameter systems. Measure almost any sample with high reliability and p...
Made for use in the lab and on-the-go, the portable refractometer is lightweight and easy to use.
Save time, reduce costs, and improve operational safety with seamless automation solutions. From simple sampling pumps to heated autosamplers. Increase results repeatability and reliability.
multiparameter system
refractometry software
refractometer accessories

Multiparameter System

Refractometry Software

Refractometer Accessories and Consumables

With Multiparameter Systems you can combine and measure refractive index, density, pH, titration and more. Increase data quality and save time by measuring all parameters at once.
Powerful software solutions for refractometry. The paperless operation will ensure data integrity, secure storage and make transcriptions free of errors. Easily review and analyze your data.
Get the most out of your refractometer by complementing it with accessories and consumables. From high tech solutions such as scanners and sensors, to a variety of certified liquid standards and more.
Refractometers

Developed for a wide range of applications, Excellence Refractometers allow for workflow automation and can be expanded to multiparameter systems. Measure almost any sample with high reliability and p...

portable refractometer

Made for use in the lab and on-the-go, the portable refractometer is lightweight and easy to use.

automated refractometry

Save time, reduce costs, and improve operational safety with seamless automation solutions. From simple sampling pumps to heated autosamplers. Increase results repeatability and reliability.

multiparameter system

With Multiparameter Systems you can combine and measure refractive index, density, pH, titration and more. Increase data quality and save time by measuring all parameters at once.

refractometry software

Powerful software solutions for refractometry. The paperless operation will ensure data integrity, secure storage and make transcriptions free of errors. Easily review and analyze your data.

refractometer accessories

Get the most out of your refractometer by complementing it with accessories and consumables. From high tech solutions such as scanners and sensors, to a variety of certified liquid standards and more.

Automated Refractive Index SystemsAutomated Refractive Index Systems


With the Excellence Refractometers, automation of the refractive index measurement workflow leads to more reliable results, increases safety, and prevents errors, reducing the need for operator interaction with the instrument. This saves time, reduces costs and improves operational safety.

Learn more

Multiparameter Systems

Multiparameter Systems.


Refractive index and density are frequently determined for the same sample. Our space-saving system enables you to combine an Excellence Density Meter with an Excellence Refractive Index cell to measure both parameters in one go. Further instruments can be connected for simultaneous measurements, e.g. of refractive index, density, pH and color.

Learn more

Software Solutions
 
Software Solutions


METTLER TOLEDO offers powerful software solutions for refractive index measurement. Paperless operation ensures data integrity, secure storage, and error-free result recording. Data can be reviewed and analyzed easily, and reports are one click away.

Learn more

 

Services

Explore our Services - Tailored to Fit your Equipment

We support and service your measurement equipment through its entire life-cycle, from installation to preventive maintenance and calibration to equipment repair.

Publications

Applications

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To find your application use the filters for Industry, Sample or use Full Text Search. Any combination of filter and full text search is possible. Note that the full text search yields only matches that include the exact word sequence of your query. Results will be shown according to each Analytical Chemistry technology from METTLER TOLEDO products.

 

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FAQ


 

What is a digital refractometer?

A digital refractometer uses the total reflection method to measure the refractive index or related values of a liquid sample. This measurement is done digitally, reducing operator influence considerably. Accuracy of up to 0.00002 or 0.01% Brix can be reached, with small sample volume (0.5 to 1 mL) and short measuring time (a few seconds).


 

How does a digital refractometer work?

Digital refractometers use a light-emitting diode, a sapphire prism and a high-resolution optical sensor. The sample is put on the prism and the measurement started. From a certain angle of incidence – the so-called critical angle – the ray of light no longer penetrates the sample but is fully reflected from its surface and is detected by the optical sensor. The refractive index is calculated from this critical angle. In addition, benchtop digital refractometers use a built-in Peltier thermostat to control the temperature of the sample.

Learn more: have a look at our interactive animation


 

Which instruments are used to measure refractive index of liquids?

The refractive index of a solution can be measured manually or digitally.

Manual methods like portable optical refractometers and ABBE optical refractometer are widely used for the determination of refractive index and related values, e.g. BRIX°, alcohol %, Baumé, Plato, etc. Although these methods are easy to use and quite inexpensive, they require expertise in every step of the manual operation protocols, which often affects the accuracy and reliability of the results.

Digital Refractometers are available as benchtop and handheld instruments. They measure liquid samples digitally, reducing operator influence considerably.

Compare digital refractometers with manual methods: Comparison of different measuring techniques


 

What is the refractive index of water?

The refractive index of water is 1.33299 at 20°C. The refractive index of water changes with the temperature, decreasing with increasing temperature (e.g. 1.33061 at 40°C). Note that this is the commonly used refractive index nD, measured with a light of wavelength of 589.3 nm (D-line of sodium).


 

How much sample volume do you need for a digital refractometer?

For most bench-top refractometers the typical volume is around 0.5 mL for samples with high surface tension and 1mL for samples with low surface tension. As only a few drops are required, the temperatures of the sample and the measuring cell equalize fast and the analysis therefore takes only a short time.


 

How much time do you need to measure a sample with a digital refractometer?

This depends on the temperature difference between the sample and the measuring cell, as well as on the sample type and the required accuracy of the measurement. This measuring time is typically a few seconds.


 

How do you adjust a digital refractometer?

Usually refractometers are adjusted with water at a specific measuring temperature. This temperature is controlled with a Peltier element, which can cool down or heat up the measuring cell to a specific temperature (e.g. 20°C). Sometimes, Brix standards are used to adjust a refractometer for the measurement of sugar concentrations. These Brix standards are often produced onsite. Smart BRIX Standard Preparation can be done using a balance and a refractometer connected to the LabX PC software, increasing the accuracy and traceability and eliminating transcription errors.


 

Which samples can be measured with digital refractometers?

Digital refractometers were originally designed for measuring homogeneous liquids. In reality, many other samples can successfully be measured, such as pasty samples or even foils. These specific samples require some additional accessories, like a press or a foil stamp. Special care has to be taken for volatile samples (where a flow cell is recommended) or non-homogenous samples where the sample must be stirred/homogenized prior to the measurement. This can be done automatically with the in-beaker homogenizing of the InMotion autosampler.

  • Webinars
Refractive Index Measurement Guide
 
 
 
 
 
 
 
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