pH and ORP Sensors

pH and ORP are important parameters of water quality and a wide range of process applications depend upon the ability to measure and control each. Both pH and ORP represent types of ion activity in liquids—pH measures hydrogen ion activity while ORP represents the potential transfer of electrons between chemicals or chemical compounds. pH and ORP sensors are designed to resist poisoning ions and feature new technology to ensure accurate communication of readings.

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Rosemount Analytical Model 1056 Dual Input Analyzer
Rosemount Analytical Model 1056 Dual Input Analyzer
Dual input analyzer offers a wide range of measurement choices supporting most industrial, commercial & municipal applications.
Some Models in Stock
Starting at $1,706.00
GF Signet 9900 Transmitter
GF Signet 9900 Transmitter
SmartPro single channel interface & multi-parameter input selection.
Some Models in Stock
Starting at $861.00 $774.90
GF Signet 2724-2726 pH and ORP Electrodes
GF Signet 2724-2726 pH and ORP Electrodes
DryLoc connector with corrosion-resistant gold-plated contacts, connects to the 2760 preamplifier or the 2750/1 sensor electronics.
Some Models in Stock
Starting at $375.30
Rosemount Analytical Model 3900 pH/ORP Sensor
Rosemount Analytical Model 3900 pH/ORP Sensor
3900 and 3900VP general purpose pH/ORP sensors.
Some Models in Stock
Starting at $519.57
E+H Liquiline CM442 Transmitter
E+H Liquiline CM442 Transmitter
Transmitter for pH, ORP, conductivity, oxygen, chlorine, turbidity, sludge level, SAC, nitrate and many other parameters.
Mfg. has some models in stock
Starting at $2,371.92
Rosemount Analytical 56 Dual Input Analyzer
Rosemount Analytical 56 Dual Input Analyzer
High resolution full color screen, local operator interface, 480 x 272 pixel display.
Some Models in Stock
Starting at $2,918.32
E+H Memosens CPS11E Orbisint pH Sensor
E+H Memosens CPS11E Orbisint pH Sensor
Digital Memosens 2.0 electrode for use in process, water, and wastewater industries.
Starting at $623.32
Rosemount Analytical Model TUpH 396R / 396RVP pH/ORP Sensor
Rosemount Analytical Model TUpH 396R / 396RVP pH/ORP Sensor
Titanium retractable body for insertion depths up to 27 inches and easy sensor removal.
Some Models in Stock
Starting at $1,008.42
GF Signet 9950 Two-Channel Transmitter
GF Signet 9950 Two-Channel Transmitter
Two channel transmitter/controller can support two sensors of same or different types in one instrument.
Some Models in Stock
Starting at $1,325.70
Testo 205 pH/Temperature Meter
Testo 205 pH/Temperature Meter
Rugged food penetration pH meter with automatic temperature compensation.
Starting at $409.50
E+H Liquiline CM444 Transmitter
E+H Liquiline CM444 Transmitter
Transmitter for pH, ORP, conductivity, oxygen, chlorine, turbidity, sludge level, SAC, nitrate and many other parameters.
Mfg. has some models in stock
Starting at $3,726.82
Rosemount Analytical 1066 Liquid Analytical Transmitter
Rosemount Analytical 1066 Liquid Analytical Transmitter
Loop-powered transmitter measures pH, ORP, conductivity, resistivity, oxygen, free chlorine, total chlorine, monochloramine and ozone.
Starting at $2,606.89
E+H Liquiline M CM42 Transmitter
E+H Liquiline M CM42 Transmitter
Two-wire field device for hazardous and non-hazardous area use in chemicals, life sciences and food.
Mfg. has some models in stock
Starting at $2,435.25
Rosemount Analytical Model 396P / 396PVP TUpH pH/ORP Sensors
Rosemount Analytical Model 396P / 396PVP TUpH pH/ORP Sensors
Submersion, insertion, polypropylene, SMART enabled, Silcore technology.
Some Models in Stock
Starting at $870.17
Rosemount Analytical Model 5081 Transmitters
Rosemount Analytical Model 5081 Transmitters
Two-wire transmitter with explosion-proof enclosure measures a wide range of parameters.
Starting at $3,876.89
E+H Memosens CPF81E Digital pH Sensor
E+H Memosens CPF81E Digital pH Sensor
Memosens 2.0 pH sensor with gel-compact electrode and double chamber reference system for use in mining operations, industrial and wastewater treatment applications.
Starting at $768.50
Rosemount Analytical Hx338+ pH Sensor
Rosemount Analytical Hx338+ pH Sensor
Steam sterilizable & autoclavable pH sensor, provides biotechnology and pharmaceutical processes with the unique Tri-Triple reference.
$784.32
GF Signet 2734-2736 pH/ORP Electrodes
GF Signet 2734-2736 pH/ORP Electrodes
Patented reference electrode design that uses the unique foul-proof patented DryLoc connector.
Starting at $617.40
Rosemount Analytical Model 389 pH/ORP Sensor
Rosemount Analytical Model 389 pH/ORP Sensor
Insertion pH/ORP sensors with optional integral preamp.
Some Models in Stock
Starting at $806.91
AquaMetrix 60/65 Series Differential pH/ORP Sensors
AquaMetrix 60/65 Series Differential pH/ORP Sensors
Accurate differential measurement with encapsulated preamplifier, transmits up to 3000 feet.
Starting at $795.00
Rosemount Analytical Model 1057 Multi-Parameter Analyzer
Rosemount Analytical Model 1057 Multi-Parameter Analyzer
Three-input intelligent analyzer monitors a wide range of water quality parameters.
Starting at $2,709.90
Rosemount Analytical Model 3300HT / 3300HTVP pH Sensor
Rosemount Analytical Model 3300HT / 3300HTVP pH Sensor
SMART enabled, high temp design, PERpH-X high performance.
Some Models in Stock
Starting at $1,049.98
Extech PH100 and PH110 ExStik pH Meters
Extech PH100 and PH110 ExStik pH Meters
Waterproof pH meter with optional refillable electrode .
Mfg. has some models in stock
Starting at $90.95
Rosemount Analytical Model 3500 pH/ORP Sensor
Rosemount Analytical Model 3500 pH/ORP Sensor
SMART technology, electrolyte solution kits, PERpH-X™ high performance.
Starting at $1,067.15
E+H Flowfit CYA27 Flow Assembly
E+H Flowfit CYA27 Flow Assembly
Assembly for chlorine measurement in drinking, industrial, and pool water.
Mfg. has some models in stock
Starting at $940.79
E+H Memosens CPS77E pH Sensor
E+H Memosens CPS77E pH Sensor
Memosens 2.0 ISFET pH electrode for food and beverage and life sciences industries, up to 160psi.
Starting at $955.56
Rosemount Analytical Model 3400HT pH / ORP Sensor
Rosemount Analytical Model 3400HT pH / ORP Sensor
SMART technology, high temp design, and fast, accurate & stable measurements.
Starting at $1,157.51
GF Signet 2774-2777 pH and ORP Electrodes
GF Signet 2774-2777 pH and ORP Electrodes
pH and ORP electrodes with DryLoc connector with gold-plated contacts featuring a PTFE double reference junction.
Starting at $640.80
E+H Orbisint CPS11 Analog pH Sensor
E+H Orbisint CPS11 Analog pH Sensor
Glass electrode for standard applications.
Mfg. has some models in stock
Starting at $360.78
E+H Liquiline CM448 Transmitter
E+H Liquiline CM448 Transmitter
Flexible multiparameter field device for all industries, modular 4 wire controller.
Mfg. has some models in stock
Starting at $5,469.07
Rosemount Analytical RBI pH Sensors
Rosemount Analytical RBI pH Sensors
Threaded in-line, submerged or ball-valve insertion pH sensor, 0 to 14 pH measuring range.
Starting at $1,045.47
AquaMetrix 2250TX Series Flow Transmitter
AquaMetrix 2250TX Series Flow Transmitter
pH, ORP, conductivity & flow parameters available, easy calibration.
$995.00
YSI ProQuatro Multiparameter Water Quality Meter
YSI ProQuatro Multiparameter Water Quality Meter
Measures a variety of combinations of dissolved oxygen, conductivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), pH, ORP, pH/ORP combination, ammonium (ammonia), nitrate, chloride and temperature.
$1,399.00
E+H Liquiline CM14 Transmitter
E+H Liquiline CM14 Transmitter
One-channel, 4-wire controller based on digital Memosens technology for the food, power, water and wastewater industries.
Some Models in Stock
Starting at $1,427.64
YSI ProDSS Multiparameter Meter
YSI ProDSS Multiparameter Meter
Portable digital sampling for the measurement of up to 17 water quality parameters, probe sold separately.
Starting at $2,053.50
Rosemount Analytical TUpH Model 396 / 396VP pH/ORP Sensors
Rosemount Analytical TUpH Model 396 / 396VP pH/ORP Sensors
Self cleaning glass bulb electrode with stainless steel body and EPDM seals .
Starting at $922.58
E+H Memosens CPS12E ORP Sensor
E+H Memosens CPS12E ORP Sensor
Digital Memosens 2.0 electrode for use in process, water, and wastewater industries.
Mfg. has some models in stock
Starting at $612.38
YSI TruLab pH/ISE 1320 Laboratory Benchtop Meter
YSI TruLab pH/ISE 1320 Laboratory Benchtop Meter
Dual channel meter for dual measurement of pH, mV (ORP) or ISE, AutoRead function improves repeatability.
Starting at $1,885.31
Seametrics TempHion Water Quality Sensor
Seametrics TempHion Water Quality Sensor
A submersible water quality sensor and datalogger that includes a pH/ORP or Bromide element.
Starting at $1,951.00
E+H Memosens CPS61E pH Sensor
E+H Memosens CPS61E pH Sensor
Digital, glass Memosens 2.0 pH electrode for the biotech, pharmaceutical, and food industries.
Starting at $883.99
AquaMetrix 2300 Input Controller
AquaMetrix 2300 Input Controller
Multi-parameter 4-20 mA input controller, input for four 4-20 mA sensors of any kind in any combination.
Starting at $2,595.00
YSI MultiLab 4010-1W Water Quality Instrument
YSI MultiLab 4010-1W Water Quality Instrument
Single channel input with wireless capability for pH, ORP, optical-Based DO/BOD, or conductivity.
Starting at $1,384.24
E+H Liquiline CML18 pH Meter
E+H Liquiline CML18 pH Meter
Multiparameter handheld device for pH/ORP, conductivity, oxygen and temperature measurement.
Starting at $1,926.64
AquaMetrix 500 Series Combination pH/ORP Sensors
AquaMetrix 500 Series Combination pH/ORP Sensors
Single junction industrial combination pH or ORP probes, flow through or submersion mountable.
Starting at $375.00
E+H Memosens CPF82E Digital ORP Sensor
E+H Memosens CPF82E Digital ORP Sensor
Memosens 2.0 ORP sensor with a gel-compact electrode and double chamber reference system for use in wastewater treatment, mineral and metal industry applications.
Starting at $744.11
E+H Memosens CPS47E pH Sensor
E+H Memosens CPS47E pH Sensor
Digital, non-glass Memosens 2.0 ISFET pH electrode for the chemical, life sciences and food industries.
Starting at $1,178.40
E+H Liquiline CM44P Transmitter
E+H Liquiline CM44P Transmitter
Multiparameter device for process photometers and Memosens sensors.
Starting at $5,756.46
E+H Memosens CPS16E pH / ORP Sensor
E+H Memosens CPS16E pH / ORP Sensor
Memosens 2.0 glass electrode for simultaneous pH and ORP measurement in applications with long-term stable conditions.
Starting at $785.79
E+H CPS97E pH Sensor
E+H CPS97E pH Sensor
Memosens 2.0 ISFET sensor for polluted media in chemical processes, paper, or pigment production.
Mfg. has some models in stock
Starting at $952.46
E+H Liquiline CM442R Transmitter
E+H Liquiline CM442R Transmitter
Compact multiparameter DIN-rail and cabinet device for all industries.
Mfg. has some models in stock
Starting at $1,668.98
AquaMetrix AM-2252 Dual Input Controller
AquaMetrix AM-2252 Dual Input Controller
pH, ORP, conductivity & ISE parameters available on both channels, 1 point calibration for pH.
$1,995.00
E+H Memosens CPS91E Digital pH Sensor
E+H Memosens CPS91E Digital pH Sensor
Memosens 2.0 pH sensor with gel-compact electrode and open aperture for use with chemical, paper, and other contaminated or fibrous media applications.
Mfg. has some models in stock
Starting at $656.55
Rosemount Analytical 398R / 398RVP pH and ORP Sensors
Rosemount Analytical 398R / 398RVP pH and ORP Sensors
TUpH Retractable pH and ORP Sensors, TUpH reference technology ensures long life in the processes that coat, foul, and poison most other electrodes.
Starting at $1,309.03
E+H Liquiport CSP44 Water Sampler
E+H Liquiport CSP44 Water Sampler
Portable, fully automatic sampling in water, wastewater and industrial applications.
Starting at $5,212.57
E+H Liquiline CM444R Transmitter
E+H Liquiline CM444R Transmitter
Expandable multiparameter DIN-rail and cabinet device for all industries.
Mfg. has some models in stock
Starting at $2,904.61
YSI MultiLab 4010-2W Water Quality Instrument
YSI MultiLab 4010-2W Water Quality Instrument
Two-channel input with wireless capability for pH, ORP, DO/BOD, and conductivity, and built-in OUR/SOUR calculations.
Starting at $1,883.44
Extech EX800/EX900 ExStick Water Quality Kits
Extech EX800/EX900 ExStick Water Quality Kits
Complete water quality assessment kits measure pH, ORP, chlorine, and temperature.
Starting at $270.59
Rosemount Analytical 398 / 398VP TUpH pH and ORP Sensor
Rosemount Analytical 398 / 398VP TUpH pH and ORP Sensor
The TUpH large area reference junction for minimal maintenance requirements, measuring range 0 to 14 pH and -1500 to 1500mV ORP.
Starting at $1,223.78
YSI EcoSense pH1000A Benchtop pH Meter
YSI EcoSense pH1000A Benchtop pH Meter
Measures pH, ORP & temperature with automatic buffer recognition for reliable calibrations.
Starting at $394.50
YSI ProSwap Digital Water Quality Meter
YSI ProSwap Digital Water Quality Meter
Versatile handheld meter with interchangeable sensors, onboard memory, built-in temperature sensor.
Starting at $1,233.25
Pyxis SP-710 and SP-710B Water Multimeter
Pyxis SP-710 and SP-710B Water Multimeter
Measures six key water treatment parameters simultaneously, Bluetooth connectivity for mobile monitoring .
Starting at $1,875.00
Extech DO700 Portable Dissolved Oxygen Meter
Extech DO700 Portable Dissolved Oxygen Meter
Measures dissolved oxygen concentration / saturation, pH, mV, conductivity, TDS, salinity, resistivity and temperature.
$955.90
E+H Liquiline To Go CYM290 Multiparameter Meter
E+H Liquiline To Go CYM290 Multiparameter Meter
Handheld multiparameter tool for pH/ORP, conductivity, oxygen and temperature measurement.
Starting at $2,394.00
GF Signet 274x pH / ORP Electrodes
GF Signet 274x pH / ORP Electrodes
High performance sensors built with the DryLoc connector, a Ryton body, and PTFE reference junction to handle extreme and harsh chemical applications.
Starting at $780.30
Rosemount Analytical Model 372 pH Sensor
Rosemount Analytical Model 372 pH Sensor
HF resistant pH sensor, enhanced resistance to process attack provided by field proven pH galss formulation.
Starting at $2,246.35
E+H CYZ71D Memobase Plus Software
E+H CYZ71D Memobase Plus Software
Multichannel multiparameter software for liquid analysis with digital Memosens sensors.
Starting at $2,463.68
YSI Pro1030 Multiparameter Meter
YSI Pro1030 Multiparameter Meter
Tough, smart and versatile pH/ORP/Conductivity/Salinity/TDS/Temperature meter designed for rugged field work.
$999.00 $949.05
Extech EC500 pH/Conductivity Meter
Extech EC500 pH/Conductivity Meter
Measures conductivity, TDS, salinity, pH, and temperature using one just electrode.
Starting at $181.99
E+H Memosens CPS31E Digital pH Sensor
E+H Memosens CPS31E Digital pH Sensor
Memosens 2.0 pH sensor with gel-compact electrode with ceramic junction for use in drinking and swimming pool water treatment applications.
Starting at $585.93
E+H Liquiline CM72 Transmitter
E+H Liquiline CM72 Transmitter
Single parameter field device for hazardous and non-hazardous applications in all industries.
Mfg. has some models in stock
Starting at $1,197.55
E+H Ceramax CPS341D pH Sensor
E+H Ceramax CPS341D pH Sensor
Memosens enamel electrode for food and life sciences industries.
Select options for pricing
E+H Memosens CPS76E pH Sensor
E+H Memosens CPS76E pH Sensor
Heavy-duty Memosens 2.0 combined electrode for simultaneous pH and ORP measurement for chemical processes and poisoning media.
Starting at $837.92
YSI Pro1020 pH / ORP & DO Meter
YSI Pro1020 pH / ORP & DO Meter
Handheld meter that measures dissolved oxygen and temperature along with either pH or ORP (redox).
$998.00 $948.10
Rosemount Analytical 397 TUpH pH Sensor
Rosemount Analytical 397 TUpH pH Sensor
Offers long life & high performance in pH & ORP measurements in aqueous solutions with high suspended solids.
Starting at $961.41
AquaMetrix PTX and RTX Series pH and ORP Sensors
AquaMetrix PTX and RTX Series pH and ORP Sensors
Fully integral differential pH and ORP .
Starting at $995.00
Extech PH90 pH Meter
Extech PH90 pH Meter
Waterproof pH meter with rugged housing and flat surface electrode.
In Stock
$106.69
Extech PH300 Waterproof pH / mV / Temperature Kit
Extech PH300 Waterproof pH / mV / Temperature Kit
Measures pH, mV and temperature at your workbench or in the field.
Mfg. has stock
$364.09
E+H Liquiline CM82 Transmitter
E+H Liquiline CM82 Transmitter
Multiparameter field device for hazardous and non-hazardous applications in all industries.
Starting at $1,669.85
E+H Memosens CPS41E Digital pH Sensor
E+H Memosens CPS41E Digital pH Sensor
Memosens 2.0 pH sensor with ceramic junction and KCl liquid electrolyte for use in chemical, laboratory and power station applications.
Starting at $921.06
E+H Memocheck Sim CYP03D Verification Tool
E+H Memocheck Sim CYP03D Verification Tool
Configurable testing tool for analysis of Memosens measuring points.
Starting at $1,383.64
AquaMetrix AM-2250 Flow Controller
AquaMetrix AM-2250 Flow Controller
pH, ORP, conductivity & flow parameters available, three control relays for rising or falling processes, easy calibration.
$1,595.00
Extech EC600 Waterproof Conductivity Meter Kit
Extech EC600 Waterproof Conductivity Meter Kit
7-in-1 meter with lab-quality performance measures conductivity, TDS, salinity, resistivity, pH, mV and temperature.
$603.90
ICON P14C Series pH Sensors
ICON P14C Series pH Sensors
Durable, functional, long term performance pH sensor for complex applications.
Starting at $699.00
E+H Liquiline CM448R Transmitter
E+H Liquiline CM448R Transmitter
Flexible multiparameter DIN-rail and cabinet device for all industries.
Starting at $4,423.54
YSI TruLab pH 1110 pH Meter
YSI TruLab pH 1110 pH Meter
Single channel benchtop meter for pH, mV (ORP) and temperature measurements in the laboratory.
$702.71
Seametrics Multiparameter Smart Sensor
Seametrics Multiparameter Smart Sensor
Configurable smart sensor that measures a variety of combinations and works with Modbus or SDI-12 interfaces.
Starting at $6,903.00
E+H Memosens CPS72E Digital ORP Sensor
E+H Memosens CPS72E Digital ORP Sensor
Memosens 2.0 ORP sensor with gel-compact electrode and ceramic junction for use in chemical process applications.
Starting at $673.15
YSI EcoSense pH100A pH/ORP Meter
YSI EcoSense pH100A pH/ORP Meter
Accurate, economical, handheld, IP67 waterproof housing.
Starting at $318.01
YSI EcoSense pH10 pH Tester
YSI EcoSense pH10 pH Tester
pH and temperature measurement in a pen-style tester with graphic display.
$141.25 $134.19
Extech RE300 ORP Meter
Extech RE300 ORP Meter
Flat surface electrodes provides "On-the-Spot" measurements.
Mfg. has stock
$133.99
Extech PH220-C Waterproof Palm pH Meter
Extech PH220-C Waterproof Palm pH Meter
Large-digit LCD display with cable pH electrode.
$191.99
YSI EcoSense ORP15 ORP Tester
YSI EcoSense ORP15 ORP Tester
ORP and temperature measurement in a pen-style tester with graphic display.
$204.00 $193.80
YSI EcoSense pH/EC1030A pH and Conductivity Pen
YSI EcoSense pH/EC1030A pH and Conductivity Pen
Easy-to-use graphic interface, simple one-hand operation, memory and IP-67 waterproof housing.
$211.25
Extech Oyster-10 Series pH / ORP / Temperature Kits
Extech Oyster-10 Series pH / ORP / Temperature Kits
Versatile pH/ORP/Temp kits for use in the lab or in the field.
Starting at $239.99
YSI EcoSense pH100M pH/ORP Meter
YSI EcoSense pH100M pH/ORP Meter
Accurate, economical, handheld, IP67 waterproof housing, 250 data sets.
Starting at $381.66
Extech DO610 Dissolved Oxygen/pH/Conductivity Kit
Extech DO610 Dissolved Oxygen/pH/Conductivity Kit
User friendly kit economically measures 6 parameters.
In Stock
$461.99
E+H Orbisint CPS12 Analog ORP Sensor
E+H Orbisint CPS12 Analog ORP Sensor
Glass electrode for standard applications.
Mfg. has some models in stock
Starting at $529.26
ICON P14G Series General Purpose pH Sensors
ICON P14G Series General Purpose pH Sensors
Long term and reliable pH senors with fast response times and high accuracy for general process applications.
Starting at $599.00
YSI Pro10 pH / ORP Meter
YSI Pro10 pH / ORP Meter
Portable, user replaceable sensors and cables, 50 data set memory, IP67 protection.
$641.75
E+H Memosens CPS92E Digital ORP Sensor
E+H Memosens CPS92E Digital ORP Sensor
Memosens 2.0 glass sensor for heavily polluted media in chemical industry, paper, pigment production.
Starting at $667.49
ICON R7G Series ORP Sensor
ICON R7G Series ORP Sensor
Platinum electrode general purpose ORP sensor.
Starting at $699.00
ICON R7C Series ORP Sensors
ICON R7C Series ORP Sensors
Gold electrode ORP sensor for complex environments.
Starting at $799.00
E+H Memosens CPS42E Digital ORP Sensor
E+H Memosens CPS42E Digital ORP Sensor
Memosens 2.0 ORP sensor for applications with fast changing medium compositions or low conductivity.
Starting at $836.90
E+H Memosens CPS96E pH / ORP Sensor
E+H Memosens CPS96E pH / ORP Sensor
Electrode for heavily polluted media and suspended solids in chemical processes, paper or paint production.
Starting at $839.67
ICON P14P Series pH Sensor
ICON P14P Series pH Sensor
¾” NPT connection with 4-20mA output.
Starting at $849.00
YSI TruLab pH 1310 & 1310P Meters
YSI TruLab pH 1310 & 1310P Meters
Single channel, laboratory quality meter for pH, mV (ORP) and temperature measurements. With datalogging and optional printer. .
Starting at $939.44
YSI MultiLab 4010-3W Water Quality Instrument
YSI MultiLab 4010-3W Water Quality Instrument
Three-channel input with wireless capability for pH, ORP, DO/BOD, and conductivity, and built-in OUR/SOUR calculations.
$2,427.36
E+H Liquiline To Go Ex CYM291 Multiparameter Meter
E+H Liquiline To Go Ex CYM291 Multiparameter Meter
Ex-certified handheld multiparameter tool for pH/ORP, conductivity, oxygen and temperature measurement, IECEx, ATEX.
Starting at $4,211.88