
pH and Electrochemistry
Instruments and other methods to measure pH, conductivity, specific ions, dissolved oxygen, and other parameters; may be handheld or benchtop and manual or electronic (analog or digital); includes pH indicator papers, electrodes, and other probes.
pH and electrochemistry meters and related products are used to assess acidity and alkalinity, conductivity, specific ion concentrations, and dissolved oxygen in water, wastewater, and other solutions. Electrochemistry meters may measure a single parameter (like pH) or they may be multiparameter meters, capable of performing a combination of tests (pH plus conductivity, for example).
Electrochemistry meters are used with various probes and electrodes designed for specific purposes or types of solutions. Electrodes with epoxy bodies are useful for testing food, beverages, and other materials where broken glass could be a problem. Other electrodes are made to withstand higher than usual impact; for use with solutions that contain large particulates; and for compatibility with biological buffers.
Electrodes must be carefully stored and maintained for optimal performance. It’s important to select the right storage bottles and electrode filling, cleaning, rinsing, and storage accessories.
Electrochemistry meters also require regular calibration and maintenance. Standard and certified pH buffers as well as conductivity and specific ion standards are available. Other accessories include electrode supports, bulb guards, cables, connectors, and adapters.
Indicator paper and test strips are another simple, portable, and qualitative way to quickly determine pH and other analytes. The paper or strips contain chemical indicators that produce color reactions. A comparison chart (included) helps to interpret the results. Available in various pH ranges, these are sometimes called “litmus” paper.






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Thermo Scientific™ Orion Star T940 All-in-One Titrator and Kits
Benefit from the integration of our core electrochemistry technology with a state-of-the-art dispensing system to create an automated all-in-one titrator, a modern, simplified automated system designed to help make performing titrations easier, more reliable and more reproducible than manual titrations.
Titration Technique | Equivalence point or preset endpoint |
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Memory | Non-volatile memory preserves data logs and settings |
Advanced ISE Functions | Multiple known addition (MKA); automated calibration and calculation of sample concentration by adding aliquots of standard to sample using the burette |
Resolution (pH) | 0.001, 0.01, 0.1 (user selectable) |
Languages | Chinese, English, French, German, Italian, Japanese, Korean, Portuguese and Spanish |
Resolution (ISE) | 0.0001 minimum, 1 to 4 significant digits (user selectable) |
Cycles Per Titration Run | 1 to 5 cycles, option to exclude cycle results from average results and RSD calculations |
Data Management Details | Data log export as CSV or PDF file, short or long format |
Display Type | 5.7 in. color capacitive touchscreen, 640 x 480 resolution |
Functions Available | Sample titration, titrant standardization, calibration and direct measure |
Resolution (mV) | 0.1 mV |
Data Points | 100 data sets each: sample titration, titrant standardization, calibration and direct measure |
Temperature Probe Calibration | Optional 1 point offset calibration |
Certifications/Compliance | CE, TUV 3-in-1, FCC, EN/EIC61326-1, IEC 61010 |
Probe Type | pH electrode, redox electrode or ion selective electrode (ISE); reference half-cell electrode; ATC temperature probe; stirrer probe |
Accuracy (mV) | ±0.2 mV |
Accuracy (ISE) | ±0.2 mV or ±0.05% of reading, whichever is greater |
Titrant Determination | Standardization titration or manual concentration input |
Warranty | 1 year replacement warranty |
Calibration Points (ISE) | 1 to 5 |
Relative Humidity Range | 5 to 85%, non-condensing |
Dimensions (L x W x H) | 10 x 16 x 14 in. (25.4 x 40.6 x 35.6 cm) |
Temperature Selection | Manual or automatic |
Precision | 0.5% RSD, dependent on environment and handling conditions |
Outputs | 3 USB ports for printer, USB flash drive and computer software connections |
Calibration Points (pH) | 1 to 5 |
Backlight Option | Yes, adjustable |
Range (mV) | -2000.0 to +2000.0 mV |
Methods | Up to 10 methods with optional password protection; import/export methods via USB flash drive |
Resolution | Burette drive offers advanced micro-step technology that provides 25,600 micro-steps per motor revolution for smooth and precise burette positioning (over 2 million micro-steps over the full burette stroke range) |
Titration Process Control | Routine, quick, careful or user defined |
Time and Date | Yes, with nonvolatile battery backup |
Updateable Firmware | Yes, using USB flash drive |
Range (pH) | -2 to 20 |
For Use With (Application) | Acid-base titrations, redox titrations, ion concentration titrations |
Titration Types | Direct or back titration |
Channels | 1 |
Accuracy (pH) | ±0.002pH |
Range (ISE) | 0.0001 to 19990 |
Titration Setup Wizard | Yes, using Start a New Titration workflow |
Stirrer Probe Speeds | 5 user selectable speeds (250 to 3700 RPM) |
Burette Sizes | 10 mL, 20 mL (included) or 50 mL |
Burette Functions | Automatic rinse cycles for flushing and discrete dispense volume with continuous option; Exceeds acc |
Inputs | BNC (pH, redox or ion selective electrode), pin-tip (reference electrode), 8 pin MiniDIN (ATC temperature probe), stirrer input (stirrer probe) |
Accuracy (Temperature) | ±0.2 °C |
Equivalence Points | 1 to 2 |
Electrical Requirements | 100-240V, 50/60 Hz |
Temperature (English) Operating | 41°F to 104°F |
Preset Endpoints | 1 to 3 |
Material | ABS Plastic |
Calibration | pH, mV, ion concentration (ISE) and temperature |
Calibration Points | 1 point relative mV (RmV) mode |
Alarm Output | Notifications for Titration Cycle Complete, Maximum Titrant Volume, Data Log Full, Calibration Due, Maintenance Reminder |
IP Rating | IP51 |
Model | Orion Star T940 |
Sample ID | Auto-incremental, manual or off |
Resolution (Temperature) | 0.1 °C |
Temperature Range (Metric) | -5.0°C to +100.0°C |
Temperature (Metric) Operating | 5°C to 40°C |
Blank Options | Fixed value or variable value using titration |
Thermo Scientific™ Elite pH Pocket Testers and Replacement Sensors
Flexible on-the-go pH and temperature testing using durable Elite pocket testers with replaceable sensors for a variety of applications including environmental monitoring, pools, spas and more!
METTLER TOLEDO™ SevenExcellence™ S400 Benchtop pH Meter
The S400 meter measures pH, redox/ORP, and ISFET. It can be expanded with additional modules to measure conductivity, resistivity, DO, BOD, ISE, salinity, and TDS. It has an intuitive touchscreen, the ability to create measurement shortcuts, and can export data to a printer, Excel, or LIMS system.
Accuracy (mV) | ±0.1 |
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Resolution (Conductivity) | 0.001 to 1 |
Range (Conductivity) | 0.001μS/cm to 2000mS/cm |
Resolution (pH) | 0.001, 0.01, 0.1 |
Range (pH) | -2 to 20 |
Accuracy (pH) | ±0.002 |
Display Type | TFT |
Resolution (mV) | 0.1/1mV |
Outputs | USB, RS-232, Ethernet |
Data Points | 20,000 |
Calibration Points (pH) | Max. 5 points, 8 pre-defined and 20 user-defined buffer group |
Resolution (Temperature) | 0.1°C |
Temperature Range (Metric) | -30°C to +130°C |
Range (mV) | -2000 to 2000 |
Accuracy (Temperature) | ±0.1°C |
Calibration Points (Conductivity) | 13 pre-defined and 20 user-defined standard |
Thermo Scientific™ Expert pH Pocket Tester
Perform on-the-go, fuss-free measurements for applications such as water treatment, environmental monitoring, education, hydroponics, agriculture, aquaculture, food & beverage and many more!
Thermo Scientific™ Elite pH Spear Pocket Testers and Replacement Sensors
Flexible on-the-go pH testing using durable Elite spear pocket testers with replaceable sensors for a variety of applications include food, beverage, agriculture and more!
Temperature Accuracy | Manual input |
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Temperature Range (English) | 32.0°F to 140.0°F |
Resolution (pH) | 0.01 |
Measurement Modes | pH |
Range (pH) | -1 to 15 |
Temperature (Metric) Operating | 5°C to 45°C (ambient) |
Temperature Range (Metric) | 0.0°C to 60.0°C |
Accuracy (pH) | ±0.02 |
Temperature Resolution | 0.1°C, 0.1°F |
Thermo Scientific™ Orion™ Versa Star Pro™ pH/ISE Benchtop Multiparameter Meter
Get premium performance and ultimate flexibility with our benchtop meter with pH/ISE module for pH, ion concentration, and temperature.
Power Rating | DC input: 9VDC, 1A |
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Memory | Non-volatile memory preserves data log, calibration log and meter settings |
Advanced ISE Functions | Segmented (point-to-point) slope, non-linear selectable auto-blank, low concentration range stabilit |
Resolution (pH) | 0.1/0.01/0.001 |
Languages | English, Spanish, French, Italian, German, Chinese, Portuguese and Korean |
Measurement Modes | pH,mV,Relative mV,ORP,Ion Concentration (ISE) with Temperature |
Range (pH) | -2 to 20 |
Resolution (ISE) | 0.0001 minimum, 1 to 4 significant digits (user selectable) |
Channels | 4 (Customizable with modules) |
Accuracy (pH) | ±0.002 |
Range (ISE) | 0.0001 to 19990 with selectable units of ppm, Molar, mg/L, %, ppb or none |
Power Supply | Universal AC adapter (included) |
Data Management Details | Transfer single, range or all data points to printer or computer |
Display Type | Color graphic LCD with user-customizable options |
Resolution (mV) | 0.1mV |
Data Points | 2000 with Date and Time Stamp |
Temperature Probe Calibration | 1 point temperature offset calibration |
Certifications/Compliance | CE, TUV 3-1, FCC Class A |
Weight (Metric) | 1.2 kg, modules add 0.2 kg each |
Accuracy (mV) | ±0.2 mV or ±0.05% of reading whichever is greater |
Accuracy (ISE) | ±0.2 mV or ±0.05% of reading whichever is greater |
Warranty | 3 year meter and module warranty |
Temperature Accuracy | ±0.1°C |
Stability | Selectable fast, medium, slow or Smart Stability setting; Selectable off or Automatic Smart averaging setting |
Calibration Points (ISE) | 1 to 6 |
Temperature (English) Operating | 41°F to 113°F (ambient) |
Isopotential Point | 7.000pH (adjustable), 1.000 ISE (adjustable) |
AC Adapter | Universal 50-60 Hz, 100-240 VAC power adapter (Cat. No. STARA-PWR) |
Log Function Type | Automatic data logging with Auto-Read, Timed and Single Shot measure modes; manual data logging with |
Calibration | pH with calibration editing option, ion concentration (ISE) with calibration editing option, relativ |
Relative Humidity Range | 5 to 85 %, non-condensing |
Calibration Points | 1 point relative mV (RmV) mode, 1 point ORP mode |
Alarm Output | Set point alarm, high/low limit alarm, calibration due alarm |
Dimensions (L x W x H) | 28cm x 24cm x 10cm (11 in. x 9.5 in. x 3.9 in.), modules add ≤ 2cm (0.8 in.) L & H |
Temperature Selection | Manual or automatic with ATC temperature probe |
IP Rating | IP54 |
Keypad | Numeric with menu-specific function keys and dual purpose scroll/shortcut keys |
Outputs | USB (2), RS232 |
Temperature Range (English) | 22.0°F to 221.0° F |
Range (Relative mV) | ±2000.0 mV |
Calibration Points (pH) | 1 to 6 |
Backlight Option | Yes |
Weight (English) | 2.5 lb., modules add 0.5 lb. each |
Temperature (Metric) Operating | 5°C to 45°C (ambient) |
Temperature Range (Metric) | -5.0°C to +105.0°C |
Range (mV) | ±2000.0 mV |
Range (ORP) | ±2000.0 mV |
Methods | 10 per channel |
Temperature Resolution | 0.1°C, 0.1°F |
Thermo Scientific™ Orion Lab Star DO Dissolved Oxygen Bench Meters
Orion Lab Star DO113 dissolved oxygen bench meters measure DO as % saturation or concentration with temperature, feature large backlit display for easy viewability, and offer small footprint to save bench space. This DO meter is ideal for simplified, budget-friendly lab testing and data recording.
Temperature (Metric) Range | -5.0°C to +105.0°C |
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Resolution (Polarographic DO) | 0.1, 1 % saturation; 0.01, 0.1 mg/L or ppm |
Pressure Range | 400.0 to 850.0 mmHg; 0.533 to 1.133 bar |
Memory | Non-volatile |
Measurement Modes | Dissolved Oxygen (% Saturation with Temperature),Dissolved Oxygen (mg/L with Temperature),Dissolved Oxygen (ppm with Temperature) |
Data Management Details | Continuous, Auto-Read and Timed read modes |
Display Type | 5 in. backlit LCD |
Data Points | 500 Sets with Date and Time Stamp |
Calibration Modes | 100 % saturation, 0 % saturation, custom concentration value |
Certifications/Compliance | CE, TUV 3-1, FCC Class A |
Temperature Probe Calibration | 1 point temperature offset calibration |
Accuracy (Temperature) | ±0.3°C, ±0.5°F |
Weight (Metric) | 700 grams |
Warranty | 3 year meter warranty |
AC Adapter | Universal 100-240 V 50/60 Hz power supply with twist-and-lock meter connection and interchangeable wall plugs for US/Japan, Euro, UK/Singapore, Australia/New Zealand and China outlets |
Sensor Types | Polarographic |
Percent Saturation Range Polarographic DO | 0.0 to 300.0 % saturation |
Log Function Type | Automatic with Auto-Read and Timed Read Modes, Manual with Continuous Read Mode |
Relative Humidity Range | 5 to 85%, non-condensing |
Alarm Output | Calibration reminder alarm |
Dimensions (L x W x H) | 187.2 x 155.2 x 61.7 mm, 7.37 x 6.11 x 2.43 in. |
IP Rating | IP54 |
Temperature Selection | Manual or automatic with ATC temperature probe |
Outputs | Computer or printer (STARA-106) |
Backlight Option | Yes |
Weight (English) | 1.54 lb. |
Resolution (Temperature) | 0.1°C, 0.1°F |
Range (Polarographic DO) | 0.0 to 300.0 % saturation; 0.00 to 30.0 mg/L or ppm |
Thermo Scientific™ Orion Lab Star EC112 Conductivity Bench Meters
Orion Lab Star EC112 conductivity bench meters measure conductivity, salinity or TDS with temperature, feature a large backlit display for easy viewability, and offer small footprint to save bench space. This conductivity meter is ideal for simplified, budget-friendly lab testing and data recording.
Salinity Measurement Modes | Natural Seawater (ppt) or Practical Salinity (PSU) |
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Memory | Non-volatile |
Cell Constant | 0.100 to 10.00 cm-1 |
Measurement Modes | Conductivity with Temperature,Salinity with Temperature,TDS with Temperature |
Temperature (Metric) Reference | 15.0, 20.0, 25.0 or 30.0°C |
Temperature Coefficient | 0 to 10 %/°C |
TDS Factor Range | 0.40 to 1.00 |
Range (Salinity) | 0.00 to 80.0 ppt; 0.00 to 42.0 PSU |
Data Management Details | Continuous, Auto-Read and Timed read modes |
Temperature Compensation | Linear (0 to 10 %/°C) or off |
Display Type | 5 in. backlit LCD |
Accuracy (Salinity) | ±0.5 % of the reading ± 1 LSD |
Resolution (Salinity) | 0.01, 0.1 ppt; 0.01, 0.1 PSU |
Accuracy (Conductivity) | ±0.5 % of the reading ± 1 LSD |
Data Points | 500 Sets with Date and Time Stamp |
Certifications/Compliance | CE, TUV 3-1, FCC Class A |
Temperature Probe Calibration | 1 point temperature offset calibration |
Inputs | 8-pin MiniDIN for conductivity with built-in ATC |
Accuracy (Temperature) | ±0.3°C, ±0.5°F |
Weight (Metric) | 700 grams |
Calibration Points (Conductivity) | 1-5 points conductivity |
Warranty | 3 year meter warranty |
Resolution (Conductivity) | 0.01, 0.1, 1 μS; 0.01, 0.1 mS |
Range (Conductivity) | 0.00 μS to 500.0 mS |
AC Adapter | Universal 100-240 V 50/60 Hz power supply with twist-and-lock meter connection and interchangeable wall plugs for US/Japan, Euro, UK/Singapore, Australia/New Zealand and China outlets |
Log Function Type | Automatic with Auto-Read and Timed Read Modes, Manual with Continuous Read Mode |
Resolution (TDS) | 0.01, 0.1, 1 ppm; 0.01, 0.1 ppt |
Calibration | Conductivity, salinity, TDS and temperature |
Calibration Points | 1 point salinity, 1-5 points TDS, 1 point temperature |
Alarm Output | Calibration reminder alarm |
Dimensions (L x W x H) | 187.2 x 155.2 x 61.7 mm, 7.37 x 6.11 x 2.43 in. |
Accuracy (TDS) | ±0.5 % of the reading ± 1 LSD |
IP Rating | IP54 |
Temperature Selection | Manual or automatic with ATC temperature probe |
Outputs | Computer or printer (STARA-106) |
Backlight Option | Yes |
Temperature Range (English) | 23.0°F to 221.0°F |
Weight (English) | 1.54 lb. |
Resolution (Temperature) | 0.1°C, 0.1°F |
Temperature Range (Metric) | -5.0°C to +105.0°C |
Compatible Probes | 2-cell and 4-cell conductivity electrodes |
Thermo Scientific™ Expert CTS Pocket Tester
Ensure accurate measurements of Conductivity, TDS, Salinity, and Temperature using the easy-to-use, large 4-digit display pocket tester for many applications.
Thermo Scientific™ Elite ORP Pocket Testers and Replacement Sensors
Flexible on-the-go ORP testing using durable Elite ORP pocket testers with replaceable sensors for a variety of applications including hydroponics, food and beverage, environmental and more!
Thermo Scientific™ Elite PCTS pH / Conductivity / TDS / Salinity Pocket Testers and Replacement Sensors
Flexible on-the-go pH, conductivity, TDS, salinity and temperature testing using durable Elite PCTS pocket testers for a variety of applications including agriculture, aquaculture, hydroponics and more!
Salinity Measurement Modes | Per practical salinity curve |
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Temperature Accuracy | ±0.6°C, ±1.0°F for 0.0 to 50.0°C; ±1.1°C, ±1.9°F for 50.1 to 60.0°C |
Resolution (Conductivity) | 0.1 μS/cm for 0.0 to 200.0 μS/cm; 1 μS/cm for200 to 2000 μS/cm; 0.01 mS/cm for 2.00 to 20.00 mS/cm |
Range (Conductivity) | 0.00 to 20.00 mS/cm |
Resolution (pH) | 0.01 |
Range (TDS) | 0.00 to 10.00 ppt |
Measurement Modes | pH,Conductivity,TDS,Salinity,Temperature |
Resolution (TDS) | 0.1 ppm for 0.0 to 100.0 ppm; 1 ppm for 100 to 1000 ppm; 0.01 ppt for 0.10 to 10.00 ppt |
Range (pH) | -1.00 to 15.00 |
TDS Factor Range | 0.40 to 1.00 (selectable) |
Accuracy (pH) | ±0.02 |
Relative Humidity Range | 5 to 85 %, non-condensing |
Range (Salinity) | 0.00 to 10.00 ppt |
Temperature Compensation | Yes |
Accuracy (TDS) | ± 1% full scale |
Accuracy (Salinity) | ± 1% full scale |
Resolution (Salinity) | 0.10 ppt |
Accuracy (Conductivity) | ± 1% full scale |
Temperature Range (English) | 32.0°F to 140.0°F |
Calibration Points (pH) | 1 to 3 |
Calibration Modes | pH, conductivity, TDS, salinity, temperature |
Temperature Probe Calibration | 1 point |
Temperature (Metric) Operating | 5°C to 45°C (ambient) |
Temperature Resolution | 0.1°C, 0.1°F |
Calibration Points (Conductivity) | 1 to 3 |
Fisherbrand™ accumet™ AE series ATC temperature probe
Fisher Scientific™ accumet™ AE series ATC temperature probes support the accumet AE150 pH meter for routine pH measurements at a budget-friendly price.

Type | Temperature Probe |
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Temperature (Metric) Range | 0°C to 100°C |
For Use With (Equipment) | 13-636-AE150 accumet AE150 pH Meter |
Temperature (Metric) Operating | 0°C to 100°C |
Fisherbrand™ accumet™ AE series Double Junction Gel pH Electrode
Fisherbrand™ accumet™ AE series pH electrodes support the accumet™ AE150 pH meter for routine pH measurements at a budget-friendly price.
