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.

Probes and Electrodes (3,042)

pH and Electrochemistry Meter Accessories (1,450)

pH Paper and other Test Strips (1,433)

Electrochemistry Meters (813)

pH Meters (532)

Benchtop Titrators (168)

16 – 30 of 6,445 results

Fisherbrand™ accumet™ AP110 Portable pH Meter Kit

Accurate measurements anytime, anywhere.

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Fisherbrand™ Traceable™ Expanded Range Conductivity Meter

Ideal for checking the purity of water from stills, deionizers, and reverse osmosis, testing laboratory glassware rinsing, measuring total dissolved solids, and making solutions.

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Thermo Scientific™ Orion™ Versa Star Pro™ pH/LogR™ Benchtop Meter

Get premium performance and ultimate flexibility with our benchtop meter with pH/LogR module for pH, mV, ORP and LogR temperature technology.

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Specifications

Power Rating	DC input: 9VDC, 1A
Memory	Non-volatile memory preserves data log, calibration log and meter settings
Resolution (pH)	0.001, 0.01, 0.1
Languages	English, Spanish, French, Italian, German, Chinese, Portuguese and Korean
Measurement Modes	pH with LogR Temperature,mV,Relative mV,ORP with Temperature
Range (pH)	-2 to 20
Channels	4 (Customizable with modules)
Accuracy (pH)	±0.002
Power Supply	Universal AC adapter (included)
Data Management Details	Transfer single, range or all data points to printer or computer
Display Type	LCD, Color Graphic with User-Customizable Options
Resolution (mV)	0.1mV
Data Points	2000 with Date and Time Stamp
Certifications/Compliance	CE, TUV 3-1, FCC Class A
Temperature Probe Calibration	1 point temperature offset calibration, 3 point LogR temperature calibration
Inputs	BNC (pH or ORP electrode), pin-tip (reference electrode), 8 pin MiniDIN (ATC temperature probe), two stirrer inputs (stirrer probe)
Accuracy (Temperature)	±0.1°C
Weight (Metric)	1.2 kg, modules add 0.2 kg each
Accuracy (mV)	±0.2 or ±0.05%, whichever is greater
Stability	Selectable fast, medium, slow or Smart Stability setting; Selectable off or Automatic Smart averaging setting
Temperature (English) Operating	41°F to 113°F (ambient)
Isopotential Point	7.000pH (adjustable)
AC Adapter	Universal 50-60 Hz, 100-240 VAC power adapter (Cat. No. STARA-PWR)
Log Function Type	Automatic with Auto-Read, Timed, and Single-shot Measure Modes, Manual
Calibration	pH with calibration editing option, relative mV, ORP, LogR temperature and temperature
Relative Humidity Range	5 to 85%, non-condensing
Alarm Output	Set point alarm, high/low limit alarm, calibration due alarm
IP Rating	IP54
Temperature Selection	Manual or automatic with ATC temperature probe, automatic with pH electrode using LogR mode
Keypad	Numeric with menu-specific function keys and dual purpose scroll/shortcut keys
Outputs	USB, RS-232
Range (Relative mV)	±2000.0mV
Backlight Option	Yes
Temperature Range (English)	22.0°F to 221.0°F
Weight (English)	2.5 lb., modules add 0.5 lb. each
Resolution (Temperature)	0.1°C, 0.1°F
Temperature (Metric) Operating	5°C to 45°C (ambient)
Temperature Range (Metric)	-5°C to +105°C
Methods	10 per channel
Range (ORP)	±2000.0mV

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.

Pricing & Availability
Specifications

Power Rating	DC input: 9VDC, 1A
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 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.

Pricing & Availability
Specifications

Titration Technique	Equivalence point or preset endpoint
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™ Orion Star™ A222 Conductivity Portable Meter

Reliably measure conductivity, TDS, salinity, resistivity and temperature with this conductivity portable meter for advanced field analysis.

Pricing & Availability
Specifications

Salinity Measurement Modes	Practical salinity (psu)
Range (Resistivity)	2 ohm to 100.0 megohm
Memory	Non-volatile memory preserves data log, calibration log and meter settings
Languages	English, Spanish, French, Italian, German and Chinese; Portuguese and Korean available with software update
Measurement Modes	Conductivity,TDS,Salinity,Resistivity with Temperature
Battery Life	800 hr.
Data Management Details	Transfer single, range or all data points to printer or computer
Display Type	Graphic LCD with Backlight
Data Points	1000 with Date and Time Stamp
Certifications/Compliance	CE, TUV 3-1, FCC Class A
Temperature Probe Calibration	1 point temperature offset calibration
Stability	Smart Stability and Smart Averaging
Warranty	3 Year Meter
Resolution (Conductivity)	0.001 μS minimum, auto ranging up to 4 significant digits
Range (Conductivity)	0.001 μS/cm to 3000 mS/cm
Log Function Type	Automatic with Auto-Read Measure Mode, Manual with Continuous Measure Mode
Battery Type	4 x AA (included)
Relative Humidity Range	5 to 85%, non-condensing
Dimensions (L x W x H)	24 x 10 x 6.5 cm (9.5 x 3.9 x 2.6 in.)
Accuracy (TDS)	0.5% of reading ±1 digit
Temperature Selection	Manual or automatic with ATC temperature probe
Keypad	Comprehensive with menu-specific function keys and dual purpose scroll/shortcut keys
Outputs	USB, RS232
Backlight Option	Yes (Selectable)
Compatible Probes	2-cell or 4-cell conductivity sensors with built-in temperature
Methods	10 per channel with password protection
Cell Constant	0.001 to 199.9cm-1
Temperature (Metric) Reference	15, 20, 25°C
Channels	1
TDS Factor Range	Linear (0.02 to 9.99)
Range (Salinity)	0.06 to 80.00 psu, 0.05 to 42.00 ppt
Temperature Compensation	Linear, nLFn (non-linear ultra pure water) or off
Accuracy (Salinity)	0.5% of reading ±1 digit
Resolution (Salinity)	0.01 psu or 0.01 ppt minimum, auto ranging
Accuracy (Conductivity)	0.5% of reading ±1 digit > 3 μS; 0.5% of reading ±0.01 μS ≤ 3 μS
Inputs	8 pin MiniDIN (conductivity sensor with built-in temperature)
Accuracy (Temperature)	±0.1°C
Weight (Metric)	0.5 kg
Calibration Points (Conductivity)	5
Temperature (English) Operating	41°F to 113°F (ambient)
Resolution (Resistivity)	1 ohm or 0.1 megohm, auto ranging
Accuracy (Resistivity)	0.5% of reading ±1 digit
AC Adapter	Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
Resolution (TDS)	0.001 ppm minimum, auto ranging up to 4 significant digits
Calibration	Conductivity and temperature
Alarm Output	Calibration due alarm (fixed 12 hour)
IP Rating	IP67
Model	Orion Star A222 Conductivity/TDS/Salinity/Resistivity/Temperature Portable Meter
Weight (English)	1.2 lb.
Resolution (Temperature)	0.1°C (0.1°F)
Temperature (Metric) Operating	5°C to 45°C (ambient)
Temperature Range (Metric)	-5°C to +105°C

Thermo Scientific™ Elite CTS Conductivity / TDS / Salinity Pin-sensor Pocket Testers and Replacement Sensors

Flexible on-the-go conductivity, TDS, salinity and temperature testing using durable Elite CTS pin-sensor pocket testers for a variety of applications including hydroponics, pools, spas and more!

Pricing & Availability
Specifications

Salinity Measurement Modes	Per practical salinity curve
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
Range (TDS)	0.00 to 10.00 ppt
Measurement Modes	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
TDS Factor Range	0.40 to 1.00 (selectable)
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
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

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!

Pricing & Availability
Specifications

Temperature Accuracy	Manual input
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

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METTLER TOLEDO™ EasyPlus Easy pH Titrator

Used to automate and speed up simple acid/base titrations. The EasyPlus Easy pH Titrator is ideal for the determining the acidity content of beverages, alkalinity of cleaning reagents and chemicals, free fatty acid content of cooking oils, and alkalinity (m-value) and acidity (p-value) of water.

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OHAUS™ Aquasearcher™ pH Meter AB41PH

The Aquasearcher™ pH Meter AB41PH is an advanced, research-grade benchtop pH meter with electrode, offering accurate, repeatable results with selectable resolution and an intelligent i-Steward system.

Pricing & Availability
Specifications

Accuracy (mV)	±0.3
Log Function Type	1000 Measurement, 10 Calibration
Resolution (pH)	0.001, 0.01, 0.1
Measurement Modes	Auto-stop,Timed,Continuous
Range (pH)	-2 to 20
Calibration	Offset
Accuracy (pH)	±0.002
Calibration Points	Up to 5
Data Management Details	Datalog with Time and Date Stamp
Display Type	LCD, 6.5 in. Segment and Dot Matrix
Outputs	USB, RS-232 (PC), RS-232 (Printer)
Data Points	1000 Sets
Backlight Option	LCD
Temperature Range (Metric)	-10°C to +125°C
Range (mV)	±2000.0
Accuracy (Temperature)	±0.3°C

Fisherbrand™ accumet™ AR425 pH/ion Meter with Stand

Designed to deliver precise and reliable electrochemistry testing, the accumet AR425 offers enhanced performance in a streamlined design. Ideal for laboratories requiring dependable measurement capabilities.

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Fisherbrand™ accumet™ Metallic ORP Combination Electrode - Mercury - Free, Ag/AgCl Reference; BNC Connector

Platinum Pin Ag/AgCl Combination electrode for environmental ORP measurements

Pricing & Availability
Specifications

Temperature (Metric) Range	-5°C to +100°C
Filling Solution Type	SP135-500
Material	Glass
For Use With (Application)	Environmental ORP measurements
Temperature (Metric) Operating	-5°C to +100°C
Internal Reference	Ag/AgCl

Fisherbrand™ accumet™ Micro Glass Mercury-Free Combination Electrodes

Ideal for microwell plates, serum cups, cuvets, micro test tubes, NMR tubes and capillary tubes

Pricing & Availability
Specifications

Diameter (English)	0.12 in.
Type	Combination Electrode
Temperature (English) Operating	32°F to 176°F
pH Range	0 to 14
Diameter (Metric)	3 mm
Material	Glass
Junction	Double
For Use With (Application)	Capillary Tubes, Cuvettes, Microwell Plates, Micro Test Tubes, NMR Tubes, Serum Cups
Temperature (Metric) Operating	0°C to 80°C
Connector Types	BNC

Fisherbrand™ accumet™ Liquid-Filled Polymer Body Combination Electrodes: Mercury-Free

Ideal for measurements in small vessels or with small samples

Pricing & Availability
Specifications

Diameter (English)	0.4 in.
Type	Combination pH Electrode
Temperature (Metric) Range	-5°C to +100°C
Length (Metric)	106 mm
Temperature (English) Operating	23°F to 212°F
pH Range	0 to 14
Diameter (Metric)	10 mm
Length (English)	4.1 in.
Material	Polypropylene
For Use With (Application)	For measurements in small vessels or with small samples
Temperature (Metric) Operating	-5°C to +100°C
Internal Reference	Ag/AgCl

Fisherbrand™ accumet™ Micro and Semimicro Size Glass Combination Electrodes - Mercury - Free

Ideal for microwell plates, serum cups, cuvets, micro test tubes, NMR tubes and capillary tubes

Pricing & Availability
Specifications

Warranty	1 Year
Temperature (Metric) Range	-5°C to +110°C
Tip Type	Micro
Temperature (English) Operating	23°F to 230°F
pH Range	0 to 14
Filling Solution Type	Saturated KCl with AgCl. KCl
Material	Glass
Junction	Single
For Use With (Application)	Small samples
Temperature (Metric) Operating	-5°C to +110°C
Internal Reference	Ag/AgCl

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pH and Electrochemistry

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