A pH meter is an analytical instrument that measures the activity or basicity of a solution, a key parameter for many applications in various industries. METTLER TOLEDO provides intuitive, easy-to-use meters that accurately measure pH, as well as other parameters such as conductivity, ion concentration, ORP/redox, and dissolved oxygen. With our meters, you can export data onto a USB memory stick, print your results, or meet stringent compliance requirements with LabX® software.
pH, conductivity or dissolved oxygen are common parameters that are often measured together in the laboratory. Choose from single- or multi-channel instruments to measure up to three parameters simultaneously in the same or different samples.
METTLER TOLEDO is a complete solution provider, from meters and sensors, to calibration solutions and software. Create an effortless pH system with seamless measurement, data transfer, and automation.
Increase productivity and eliminate measurement inconsistencies among users with SevenExcellence™ meter and InMotion™ autosampler. This system supports USP <791> and <645> compliance, and offers fully automated calibration of sensors and measurements of up to 300 samples. Read more
Working in harsh environments may require a specially protected instrument to extend the device’s durability and lifetime. We offer portable and benchtop meters with IP67 and IP54 protection, which makes them water-or dust-resistant and protected against chemicals.
We support and service your measurement equipment through its entire life-cycle, from installation to preventive maintenance and calibration to equipment repair.
A pH meter is an analytical instrument used to measure the activity of hydrogen ions in a solution which is then expressed as pH. Measuring pH is a widely applied analytical technique in various fields and ranges from laboratory measurements to process applications. With our pH meters, one can also measure other important parameters like Conductivity, Ion Concentration, ORP, and Dissolved Oxygen. This page shows the types of laboratory pH meters and their applications.
There are mainly two techniques to measure pH: pH indicators and pH meters. However, not all of them provide the same accuracy and quality level. A comparison between two widely used methods is shown below:
A pH meter measures the potential differences between a reference electrode (like Ag/AgCl) and a pH electrode (glass electrode). This difference between the two electrodes is related to the concentration of H+ ions in the solution. Therefore, the difference in potential corresponds to the acidity / pH of the solution.
pH meters are used for a variety of applications across many sectors such as:
The choice of pH meter largely depends upon the type of application (laboratory or field). Based on the application and its needs, the meters are classified as:
Yes, we offer professional installation packages, qualification and calibration services. These services will guarantee accurate and precise measurements making the user worry-free when it comes to possible compliance issues during quality audits.
Yes, calibration helps in determining that the instrument is functioning correctly. Calibration is necessary to adjust the slope and offset an electrode to their true values for the measuring system in question. With routine calibration of the pH meter, ion meter, DO meter and conductivity meters, one can confidently conduct their measurements.
pH meters are calibrated with appropriate laboratory calibration solutions of known pH. The frequency of calibration depends upon the frequency of the usage of the meter and applications. Nevertheless, one calibration day is recommended. For details please refer to the following calibration video.
This depends on the application. Dedicated single channel meters are used to measure one parameter at a given instance like:
c. Ion concentration
e. Dissolved oxygen
Whereas multi-parameter instruments allow the measurement of more than one parameter at the same time.
A conductivity meter measures the conductivity or amount of electrical conductance of a solution. The higher the conductivity, the better the ability to pass a current through the solution. Conductivity is an important parameter and has several applications in water analysis, food and beverage, electronics and pharmaceutical industries.
Yes, our instruments support 13 languages. This makes selecting the right settings from the menu intuitive because the instrument speaks your language. Currently, our instruments support English, German, French, Spanish, Portuguese, Italian, Russian, Chinese, Japanese, Korean, Polish, Thai and Turkish languages.
We offer benchtop meters that are built to last by withstanding spills on the housing and connections. This provides protection while allowing for easy cleaning with a damp cloth (IP54 protection). Similarly, our portable meters are completely waterproof and made to withstand harsh and demanding field applications (IP67 protection).
Indeed, we have meters, which support the printing of results in 3 different formats or even customized reports (or printouts) and other information to compact printers such as the RS-P25 or USB-P25.
The METTLER TOLEDO pH Competence and Support Center (pH CSC) comprises of a team of experts in direct electrochemical analysis. Due to the team's close contact with customers, technical support, product management and product development, quick advice and effective solutions can be provided, making this service rather unique in the world of pH analysis.
The offered technical and applicative support encompasses the following measuring parameters and the related METTLER TOLEDO pH Lab equipment: