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 (2,429)

pH and Electrochemistry Meter Accessories (1,148)

pH Paper and other Test Strips (855)

Electrochemistry Meters (649)

pH Meters (431)

Benchtop Titrators (126)

1 – 15 of 4,593 results

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Fisherbrand™ accumet™ Basic AB315 Benchtop Laboratory pH/mV Meter

Ideal for daily pH testing of your routine laboratory samples, the accumet™ Basic AB315 Benchtop Meter provides essential functions needed for common pH measurements without complicated functions, all at a budget-friendly price.

Pricing & Availability
Specifications

Memory	Non-volatile
Resolution (pH)	0.01, 0.1
Measurement Modes	pH with mV and Temperature,Relative mV with mV and Temperature
Range (pH)	-2 to 18
Channels	1
Accuracy (pH)	±0.01
Temperature Compensation	Automatic, Manual
Data Management Details	Printed or CSV Format
Display Type	5 in. LCD
Voltage	100/240 V
Resolution (mV)	1 mV, 0.1 RmV
Data Points	500
Inputs	BNC, ATC
Accuracy (Temperature)	±0.3°C (±0.5°F)
Accuracy (mV)	±0.2 or ±0.05%, Whichever is Greater
Stability	Indicator Icons
Warranty	3 Years
AC Adapter	Universal Power Adapter
Log Function Type	Automatic, Manual
Calibration	pH, Relative mV, Temperature
Calibration Points	1 to 5 (pH), 1 (Relative mV), 1 (Temperature)
IP Rating	IP54
Model	AB315
Outputs	Port for Computer or Printer
Frequency	50/60 Hz
Range (Relative mV)	±2000 mV
Backlight Option	Yes
Temperature Range (English)	23°F to 221°F
Calibration Points (pH)	USA: 2, 4.01, 7, 10.01, 12; NIST: 1.68, 4.01, 6.87, 9.18, 12.46; DIN: 1.09, 3.06, 4.65, 6.79, 9.23, 12.75; FSCI: 1, 3, 6, 8, 10, 13
Resolution (Temperature)	0.1°C (0.1°F)
Temperature Range (Metric)	-5°C to +105°C
Range (mV)	±2000 mV

Fisherbrand™ Traceable™ Conductivity/TDS Meter Pen

Easy-to-use, waterproof conductivity/TDS meter designed for routine analysis and quality control. Simply turn on, insert, and simultaneously read result and temperature.

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Mettler Toledo™ FiveEasy™ F20 pH/mV Meters

Compact, benchtop meter provides high quality pH/mV measurements with simple click of a button

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Specifications

Accuracy (mV)	±1
Memory	Current calibration
Resolution (pH)	0.01
Range (pH)	0 to 14
Calibration	Linear
Accuracy (pH)	±0.01
Temperature Compensation	ATC and MTC
Dimensions (L x W x H)	22.7 x 14.7 x 7 cm (9 x 5.7 x 2.7 in.)
Display Type	LCD
Voltage	120/240 V
Model	F20
Resolution (mV)	1mV
Frequency	50/60 Hz
Temperature Range (English)	32°F to 212°F
Weight (English)	1.4 lb.
Resolution (Temperature)	0.1°C
Temperature Range (Metric)	0°C to 100°C
Range (mV)	2000 to 2000
Inputs	BNC, Cinch, NTC 30kiloOhm sensors
Accuracy (Temperature)	0.5°C
Weight (Metric)	0.63 kg

Fisherbrand™ Traceable™ Conductivity Meter Pen

Easy-to-use, waterproof conductivity meter designed for routine analysis and quality control. Simply turn on, insert, and simultaneously read result and temperature.

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Fisherbrand™ accumet™ AB200 Benchtop pH/Conductivity Meters

Provides intuitive, simple operation and high accuracy measurements in a compact, affordable meter. Fisherbrand accumet AB200 pH/conductivity meter combines the benefits of a pH meter and conductivity meter in one easy to use, reliable measurement system. The large backlit display offers great visibility in laboratory environments.

Pricing & Availability
Specifications

Range (Resistivity)	2 W to 20 MW
Resolution (pH)	0.1/0.01/0.001
Cell Constant	0.010 to 10.000
Range (pH)	-2 to 20
Accuracy (pH)	±0.002
Range (Salinity)	0 to 80 ppt
Data Management Details	Manual, timed (selectable every 3 to 3600 sec.), printer or CSV format
Display Type	LCD
Accuracy (Salinity)	± 1% full scale
Resolution (Salinity)	0.01/0.1ppm, 0.001/0.01/0.1ppt
Voltage	100/240 V
Accuracy (Conductivity)	±1% FS
Resolution (mV)	0.1mV
Data Points	500
Inputs	BNC, ATC
Calibration Points (Conductivity)	Automatic (4 points), maximum 1/range, manual (5 points), maximum 1/range
Accuracy (mV)	±0.2 mV
Warranty	3 Years
Temperature Accuracy	±0.3°C
Resolution (Resistivity)	0.01/0.1W, 0.001/0.1kW, 0.01MW
Resolution (Conductivity)	0.01/0.1μS, 0.001/0.01/0.1mS
Range (Conductivity)	0 μS to 500 mS
Accuracy (Resistivity)	± 1% full scale
Range (TDS)	0 ppm to 500 ppt (at TDS factor 1)
Resolution (TDS)	0/0.1ppm, 001/01/0.1ppt
Accuracy (TDS)	± 1% full scale
Outputs	RS232 (phono plug), mini-B USB, stirrer
Frequency	50/60Hz
Calibration Points (pH)	Up to 6 preset or 5 custom
Range (mV)	±2000 mV
Temperature Resolution	0.1°C

METTLER TOLEDO™ InLab™ Conductivity Benchtop Probes

A selection of conductivity probes suitable for all applications.

Pricing & Availability
Specifications

Sensor Types	Integrated Temperature Sensor
For Use With (Application)	General conductivity measurements
Connector Types	Mini-DIN

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.

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METTLER TOLEDO™ Portable pH/Conductivity/Dissolved Oxygen/Ion Meters

Water and dust proof, IP67 rated meter for portable or field measurements. Portable meters compatible with pH, conductivity, dissolved oxygen, and ion selective electrodes.

Pricing & Availability
Specifications

IP Rating	IP67
Certifications/Compliance	ISO 9001:2000

Thermo Scientific™ Orion™ Single Junction Epoxy Bodied pH/ATC Triode™

Accurately measure pH and temperature together in just one electrode, with a built-in temperature sensor.

Pricing & Availability
Specifications

Diameter (English) Body	0.47 in.
Description	pH/ATC Triode
Length (Metric)	120 mm
Temperature (English) Operating	32°F to 176°F
pH Range	0 to 14
Length (English)	4.7 in.
Diameter (Metric) Cap	16 mm
Junction	Wick
Material	Epoxy
Diameter (Metric) Body	12 mm
For Use With (Application)	The Thermo Scientific Orion 9107BN Triode 3-in-1 pH/automatic temperature compensation probe has a low maintenance gel filled electrode with built-in ATC.For field or plant use.
Temperature (Metric) Operating	0°C to 80°C
Reference Type	Ag/AgCl

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METTLER TOLEDO™ S479 SevenExcellence™ pH/Conductivity/DO Benchtop Meter Kit

The S479 meter kit gives you everything you need to start measuring pH, conductivity, dissolved oxygen, BOD, resistivity, salinity, TDS, Redox/ORP, and ISFET all on one meter. It has an intuitive touchscreen, measurement shortcuts, and can export data to a printer, Excel file, or LIMS system.

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

Get premium performance and ultimate flexibility with our benchtop pH meter for pH, mV, ORP and temperature measurements on customizable color display.

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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,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
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 and temperature
Relative Humidity Range	5 to 85%, non-condensing
Calibration Points	1 to 6
Alarm Output	Set point alarm, high/low limit alarm, calibration due alarm
IP Rating	IP54
Temperature Selection	Manual or automatic with ATC temperature probe
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

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Mettler Toledo™ pH Meter SevenDirect SD20

The SevenDirect SD20 is an accurate and flexible benchtop meter for the determination of pH and ORP. The instrument is the replacement of the SevenCompact and is delivered with an EasyPlace sensor arm.

Pricing & Availability
Specifications

Memory	2000 Standard Measurements
Log Function Type	Automatic, Manual
Resolution (pH)	0.001, 0.01, 0.1
Range (pH)	-2 to 20
Accuracy (pH)	0.002
Calibration Points	Up to 5
Dimensions (L x W x H)	195 x 205 x 65 mm
Data Management Details	PC, Printer, USB Stick
Display Type	Color TFT
IP Rating	IP54
Data Points	2000
Backlight Option	Yes
Temperature Range (English)	-22°F to +266°F
Weight (English)	1.9 lb.
Resolution (Temperature)	0.1°C
Temperature Range (Metric)	-30°C to +130°C
Range (mV)	-2000 to 2000 mV
Accuracy (Temperature)	±0.1°C between 0°C and 100°C
Weight (Metric)	850 g

METTLER TOLEDO™ InLab™ Versatile pH Electrode

A plastic, refillable pH electrode with an integrated temperature sensor ideal for measuring liquids. Electrode features a replaceable ceramic junction, which offers a solution to contaminated junctions without the higher cost or cleaning efforts required with open or sleeve junctions.

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Thermo Scientific™ Orion™ Pro Star MP218 pH/ion, Conductivity and DO Bench Meter

Designed to provide accurate and reliable pH, ORP, ion, conductivity, TDS, salinity, resistivity, DO, barometric pressure and temperature analysis, the Thermo Scientific™ Orion™ Pro Star MP218 bench meter is well suited for laboratories that desire a modern meter with advance performance.

Pricing & Availability
Specifications

Salinity Measurement Modes	Natural Seawater (ppt), Practical Salinity Units (PSU), or % NaCl
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
Range (Resistivity)	1.0Ω to 100.0 MΩ
Memory	Non-volatile
Advanced ISE Functions	Single known addition, single known subtraction, double known addition, double known subtraction, analyte addition and analyte subtraction
Resolution (pH)	0.1, 0.01 or 0.001 pH
Languages	Chinese, English, French, German, Italian, Japanese, Korean, Portuguese, Spanish
Measurement Modes	pH,ORP,mV,Ion Concentration (ISE),Conductivity,Dissolved Oxygen (mg/L),Temperature,Barometric Pressure
Resolution (ISE)	0.0001 minimum, 1 to 5 digits
Barometric Pressure Correction	Yes, automatic with built-in barometer or manual
Display Type	7-in. High-resolution Color Graphic LCD
Resolution (mV)	0.1 mV
Resolution (Ion)	0.0001 minimum, 1 to 5 digits
Data Points	10,000 with Date and Time Stamp
Calibration Modes	Water-saturated air (100% and 0% saturation), air-saturated water (100% and 0% saturation) or custom concentration value (Winkler)
Temperature Probe Calibration	1 or 2 point temperature offset calibration
Certifications/Compliance	CE, TUV 3-1, FCC Class A
Probe Type	Polarographic or optical DO electrode
Salinity Factor	0.0 to 50.0 ppt; automatic with conductivity measurement or manual entry
Accuracy (mV)	±0.2 mV or ±0.05% of the reading, whichever is greater
Accuracy (ISE)	±0.2 mV or ±0.05% of the reading, whichever is greater
Warranty	2 year meter warranty
Temperature Accuracy	±0.3°C, ±0.5°F
Calibration Points (ISE)	Up to 5
Resolution (Conductivity)	0.001 μS/cm minimum, auto-ranging, up to 4 digits
Range (Conductivity)	0.010 μS/cm to 3000 mS/cm
Log Function Type	Automatic with Auto-Read and Timed Read Modes, Manual with Continuous Read Mode
Percent Saturation Range Polarographic DO	0.0 to 600.0% saturation
Range (RDO)	0.0 to 600.0% saturation; 0.01 to 90.0 mg/L or ppm
Dimensions (L x W x H)	218.9 x 153.2 x 91.33 mm; 8.62 x 6.03 x 3.60 in.
Accuracy (TDS)	±0.5% reading
Temperature Selection	Automatic with ATC temperature sensor, ambient or manual
Percent Saturation Range (RDO)	0.0 to 600.0% saturation
Keypad	Capacitive touchscreen user interface
Outputs	USB flash drive, computer or printer (STARA-106)
Temperature Range (English)	-22.0°F to +266.0°F
Range (Relative mV)	-2000 to 2000 mV
Calibration Points (pH)	1 to 5 points
Backlight Option	Yes
Percent Saturation Relative Accuracy (RDO)	±2% saturation
Range (Polarographic DO)	0.0 to 600.0% saturation; 0.01 to 90.0 mg/L or ppm
Range (mV)	-2000 to 2000 mV
Accuracy (Barometer)	±6.0 mmHg; ±0.008 bar
Range (ORP)	-2000 to 2000 mV
Methods	10 per channel (30 total)
Cell Constant	0.100 cm-1, 0.475 cm-1, 0.550 cm-1, 1.000 cm-1, 10.00 cm-1 or user-defined from 0.001 to 199.9 cm-1
Temperature (Metric) Reference	5, 10, 15, 20, 25 or 30°C
Range (pH)	-2 to 20
TDS Factor Range	Linear (0.01 to 10.00), ISO/EN 27888, 442, NaCl
Channels	3
Accuracy (pH)	±0.002 pH
Range (ISE)	0.0001 to 19999
Range (Salinity)	0.010 to 80.00 ppt; 0.01 to 42.00 PSU; or 0.01 to 400.0% NaCl
Resolution (RDO)	0.1, 1% saturation; 0.01, 0.1 mg/L or ppm
Temperature Compensation	Linear (0.00 to 10.00 %/°C), nLFn (non-linear natural water), nLFu (non-linear ultra-pure water), EP/USP or off
Accuracy (Salinity)	±0.5% reading
Resolution (Salinity)	0.001 ppt minimum; 0.01 PSU minimum; or 0.01% NaCl minimum, auto-ranging
Percent Saturation Resolution (RDO)	0.1, 1% saturation
Accuracy (Conductivity)	±0.5% reading
Resolution (DO)	0.1, 1% saturation; 0.01, 0.1 mg/L or ppm
Percent Saturation Relative Accuracy (Polarographic DO)	±2% saturation
Inputs	Channel 1: BNC for pH, ORP or ISE, 8-pin MiniDIN for ATC, pin-tip for reference; Channel 2: 8-pin MiniDIN for conductivity with ATC; Channel 3: 9-pin MiniDIN for dissolved oxygen with ATC
Weight (Metric)	1.00 kg
Resolution (ORP)	0.1 mV
Calibration Points (Conductivity)	1 to 5 points
Accuracy (DO)	±2% saturation; ±0.02 mg/L or ppm
Resolution (Resistivity)	0.1 Ωminimum, auto-ranging
Isopotential Point	7.000 pH; 1.000 ion concentration
Accuracy (Polarographic DO)	±2% saturation; ±0.02 mg/L or ppm
Accuracy (Resistivity)	±0.5% reading
AC Adapter	Universal 100-240 V 50/60 Hz power supply with wall plugs for US/Japan, Euro, UK/Singapore, Australia/New Zealand and China outlets
Range (TDS)	0.010 ppm to 500.0 ppt (TDS factor of 1.00); or 0.010 mg/L to 500.0 g/L (TDS factor of 1.00)
Resolution (TDS)	0.001 ppm or mg/L minimum, auto-ranging, up to 4 digits
Calibration	pH, ORP, Ion Concentration, Conductivity, TDS, Salinity, DO, Barometric Pressure, Temperature
Accuracy (ORP)	±0.2 mV or ±0.05% of the reading, whichever is greater
Calibration Points	1 to 5 (pH), 1 (ORP), 1 to 5 (ion), 1 to 5 (conductivity), 1 to 5 (TDS), 1 (salinity), 1 to 2 (DO), 1 (barometer), 1 to 2 (temperature)
Alarm Output	Calibration reminder alarm, high and low limit alarm per parameter
IP Rating	IP54
Percent Saturation Resolution (Polarographic DO)	0.1, 1% saturation
Weight (English)	2.20 lbs.
Range (Ion)	0.0001 to 19999
Temperature Range (Metric)	-30.0°C to +130.0°C
Range (DO)	0.0 to 600.0% saturation; 0.01 to 90.0 mg/L or ppm
Temperature Resolution	0.1°C, 0.1°F
Accuracy (RDO)	±2% saturation; ±0.02 mg/L or ppm

Thermo Scientific™ Orion™ Single Junction Combination pH Electrodes

Conduct routine, small volume or flat surface pH measurement with Thermo Scientific™ Orion™ economy series pH electrodes.

Pricing & Availability
Specifications

Type	Combination pH Electrode
Description	Permanently gelled Ag/AgCl electrolyte
Length (Metric) Cable	1 m
Temperature (English) Operating	32°F to 176°F
Refillable	Non-refillable
Reference Electrolyte	Ag/AgCl
Material	Epoxy
Junction	Wick
Temperature (Metric) Operating	0°C to 80°C

pH and Electrochemistry

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METTLER TOLEDO™ InLab™ Conductivity Benchtop Probes GSA/VA ContractAvailable on GSA/VA contract for Federal Government customers.Learn More

Mettler Toledo™ pH Meter SevenDirect SD20 Greener ChoiceOffers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More

METTLER TOLEDO™ InLab™ Versatile pH Electrode GSA/VA ContractAvailable on GSA/VA contract for Federal Government customers.Learn More

METTLER TOLEDO™ InLab™ Conductivity Benchtop Probes

Mettler Toledo™ pH Meter SevenDirect SD20

METTLER TOLEDO™ InLab™ Versatile pH Electrode