Tackle your pH and ORP sample analysis with ease

Unlock precision and performance with Orion bench and portable pH/ORP meters. Whether in the lab or the field, achieve accurate measurements for pH and oxidation-reduction potential (ORP). Our bench pH/ORP meters are expertly engineered to provide precise laboratory analysis- featuring advanced functionality and robust data management. For field applications, our portable pH/ORP meters offer high performance in compact, easy-to-carry designs- ensuring reliable testing in a variety of environments. From detailed lab work to quick, on-the-go measurements, Orion pH/ORP meters are the ideal solution to help tackle your analytical challenges. Browse our complete portfolio or let one of our experts assist you in making the right selection.


Select your pH/ORP bench or portable meter

 

Premium

Advanced

Basic

 Orion Versa Star Pro
pH/ORP Bench Meter
(Versa Star Pro series)
Orion Pro Star PH211
pH/ORP Bench Meter

(Pro Star series)
Orion Lab Star PH111 
pH/ORP Bench Meter

(Lab Star series)
 Premium pH and ORP benchtop meters

 Versatile, high-performance laboratory metersEasy to use, dependable laboratory metersEconomical, simplified
laboratory meters
Ideal for
applications in: 
Pharmaceuticals,
biotechnology, industrial
Environmental, water/ wastewater, food & beverage, industrialAcademic, 
environmental, power
pH range–2.000 to 20.000–2.000 to 20.000 –2.000 to 18.000
pH resolution0.001 / 0.01 / 0.10.001 / 0.01 / 0.10.001 / 0.01 / 0.1 
pH calibration pointsUp to 6Up to 5Up to 5
mV, RmV/ORP modesYesYesYes
Temperature range-5 to 105°C
23 to 221°F
-30 to 130°C
-22 to 266°F
-5 to 105°C
23 to 221°F
Number of channels4, customizable with modules11
Stirrer probe inputs21
Display5.3-inch, backlit color display7-inch, high-resolution,
backlit color display
5-inch, backlit segmented display
TouchscreenNoYesNo
Onscreen text promptsStep-by-step calibration and
guided setup instructions
Step-by-step calibration and
guided setup instructions
Basic calibration and
setup instructions
Identification optionsElectrode ID, sample ID, user IDElectrode ID, sample ID, user ID
Data log2000 with date/time10000 with date/time500 with date/time
Calibration log30 per parameter20 per parameter
Data export optionsComputer, printerComputer, printer, USB flash driveComputer, printer
Power supplyUniversal, 100–240 VAC, 50-60 Hz (Cat. No. STARA-PWR)Universal, 100-240 VAC, 50-60 Hz (Cat. No. PSTAR-PWR),
9 DC adapter, 2.0A
Universal, 100-240 VAC, 50-60 Hz (Cat. No. LSTAR-PWR),
9 DC adapter, 1.3A
 

Premium

Advanced

Basic

 Orion Star A321 pH Portable Meter
(Star A3210 series)
Orion Star A221 pH Portable Meter
(Star A2210 series)
Orion Star A121 pH Portable Meter
(Star A1210 series)
 Premium pH and ORP measurement portable metersAdvanced ORP and pH measurement portable metersBasic ORP and pH measurement benchtop meters
 Premium rugged,
easy-to-use
portable field meters
Advanced portable meters, easy-to-use, dependable field metersBasic portable meters, budget-friendly, simplified field meters
Ideal for
applications in:
pH, mV, ORP, and temperature testing, and field applicationsAdvanced pH analysis ideal for outdoor environments and field applicationsIP67-rated housing for rugged protection in outdoor environments
pH range–2.000 to 20.000 pH–2.000 to 20.000 pH2.00 to 16.00 pH
pH resolution0.1. 0.01, 0.001 pH0.1. 0.01, 0.001 pH0.1. 0.01 pH
pH relative accuracy±0.002 pH±0.002 pH±0.01 pH
pH calibration pointsUp to 5Up to 5Up to 3
mV modeYesYesYes
ORP modeYesYesNo
Range (temperature)–5.0° to 105.0°C,
22.0° to 221.0°F
–5.0° to 105.0°C,
22.0° to 221.0°F
–5.0° to 105.0°C,
22.0° to 221.0°F
Temperature compensationAutomatic or manualAutomatic or manualAutomatic or manual
Data points5000 with date and time stamp1000 with date and time stamp50
Data export optionsRS232, USBRS232, USB---
Power supply4 AA batteries: 800 hrs. battery life (included) or optional universal, 100–240 VAC (sold separately)4 AA batteries: 800 hrs. battery life (included) or optional universal, 100–240 VAC (sold separately)4 AA batteries: 2,000 hrs. battery life (included) or optional universal, 100–240 VAC (sold separately)
  Enhance your productivity with accessories for your benchtop and portable meters. Meter Accessories ›
 

Advanced

Basic

 Eutech pH2700 pH Bench MeterEutech 1710 pH Bench Meter
 
 Economical, routine laboratory metersBudget-friendly, simple laboratory meters
pH range-2.000 to 20.000-2.00 to 18.00
pH resolution0.001 / 0.01 / 0.10.01
pH calibration pointsUp to 6Up to 5
mV, RmV modesYesYes
ORP modeYesYes
Temperature range0.0 to 100.0 °C, 32.0 to 212.0 °F-5.0 to 105.0 °C
Backlit displayYesYes
Onscreen text promptsBasic calibration and setup promptsBasic calibration and setup prompts
Number of channels11
Data log500 with date/time100
Calibration logMost recent viewable on meter and stored in meter memoryActive pH, RmV, temperature with time and date
Data export optionsRS232Computer or printer
Power supplyUniversal, 100-240VAC, 50/60 Hz, Cat. No. 60X426401Universal, 100–240VAC, 50–60Hz (Cat. No. EB1700PWR), 9 DC adapter, 1.3A

Watch the video and learn more.

Features & Benefits of the Eutech 1710 pH/mV Bench Meter

 

Premium

Advanced

Advanced

Basic

Basic

 

Eutech pH 450 Portable Meter

Eutech pH 150 Portable Meter

Eutech pH 600 Series Portable Meter

Eutech pH 6+ Portable Meter

Eutech pH 5+ Portable Meter

 
 
pH range-2.00 to 16.00-2.00 to 16.00-2.00 to 20.000.00 to 14.000.00 to 14.00
pH resolution0.01 pH0.01 pH0.1 / 0.01 Ph0.01 pH0.01 pH
pH relative accuracy±0.01 pH±0.01 pH±0.01 pH±0.01 pH±0.01 pH
pH calibration pointsUp to 6Up to 5Up to 6Up to 3Up to 3
mV modeYesYesYesYes---
ORP mode------YesYes---
Backlit displayYes---Yes------
Range (temperature)-10.0 to 110.0 °C (14.0 to 230.0 °F)-10.0 to 110.0 °C (14.0 to 230.0 °F)-10.0 to 110.0 °C (14.0 to 230.0 °F)0.0 to 100.0 C0.0 to 100.0 C
Onscreen test promptsBasic calibration and setup promptsBasic calibration and setup promptsBasic calibration and setup promptsBasic calibration and setup promptsBasic calibration and setup prompts
Temperature compensationAutomatic or manualAutomatic or manualYesAutomatic or manualAutomatic or manual
Data points500 with date and time stamp150500 with date and time stamp------
Data export optionsUSB or RS232---RS232C through LED, IrDA------
Power supplyTwo AA batteries (included) / 9 V DC adapter, 1.3 A (100/240 VAC, SMPS) (optional)Two AA batteries (included) / 9 V DC adapter, 1.3 A (100/240 VAC, SMPS) (optional)Four AA batteries (included) / 9 V DC adapter (500 mA)4 x AAA batteries4 x AAA batteries
 

Premium

Advanced

Basic

 Orion Versa Star Pro
pH/ORP Bench Meter
(Versa Star Pro series)
Orion Pro Star PH211
pH/ORP Bench Meter

(Pro Star series)
Orion Lab Star PH111 
pH/ORP Bench Meter

(Lab Star series)
 Premium pH and ORP benchtop meters

 Versatile, high-performance laboratory metersEasy to use, dependable laboratory metersEconomical, simplified
laboratory meters
Ideal for
applications in: 
Pharmaceuticals,
biotechnology, industrial
Environmental, water/ wastewater, food & beverage, industrialAcademic, 
environmental, power
pH range–2.000 to 20.000–2.000 to 20.000 –2.000 to 18.000
pH resolution0.001 / 0.01 / 0.10.001 / 0.01 / 0.10.001 / 0.01 / 0.1 
pH calibration pointsUp to 6Up to 5Up to 5
mV, RmV/ORP modesYesYesYes
Temperature range-5 to 105°C
23 to 221°F
-30 to 130°C
-22 to 266°F
-5 to 105°C
23 to 221°F
Number of channels4, customizable with modules11
Stirrer probe inputs21
Display5.3-inch, backlit color display7-inch, high-resolution,
backlit color display
5-inch, backlit segmented display
TouchscreenNoYesNo
Onscreen text promptsStep-by-step calibration and
guided setup instructions
Step-by-step calibration and
guided setup instructions
Basic calibration and
setup instructions
Identification optionsElectrode ID, sample ID, user IDElectrode ID, sample ID, user ID
Data log2000 with date/time10000 with date/time500 with date/time
Calibration log30 per parameter20 per parameter
Data export optionsComputer, printerComputer, printer, USB flash driveComputer, printer
Power supplyUniversal, 100–240 VAC, 50-60 Hz (Cat. No. STARA-PWR)Universal, 100-240 VAC, 50-60 Hz (Cat. No. PSTAR-PWR),
9 DC adapter, 2.0A
Universal, 100-240 VAC, 50-60 Hz (Cat. No. LSTAR-PWR),
9 DC adapter, 1.3A
 

Premium

Advanced

Basic

 Orion Star A321 pH Portable Meter
(Star A3210 series)
Orion Star A221 pH Portable Meter
(Star A2210 series)
Orion Star A121 pH Portable Meter
(Star A1210 series)
 Premium pH and ORP measurement portable metersAdvanced ORP and pH measurement portable metersBasic ORP and pH measurement benchtop meters
 Premium rugged,
easy-to-use
portable field meters
Advanced portable meters, easy-to-use, dependable field metersBasic portable meters, budget-friendly, simplified field meters
Ideal for
applications in:
pH, mV, ORP, and temperature testing, and field applicationsAdvanced pH analysis ideal for outdoor environments and field applicationsIP67-rated housing for rugged protection in outdoor environments
pH range–2.000 to 20.000 pH–2.000 to 20.000 pH2.00 to 16.00 pH
pH resolution0.1. 0.01, 0.001 pH0.1. 0.01, 0.001 pH0.1. 0.01 pH
pH relative accuracy±0.002 pH±0.002 pH±0.01 pH
pH calibration pointsUp to 5Up to 5Up to 3
mV modeYesYesYes
ORP modeYesYesNo
Range (temperature)–5.0° to 105.0°C,
22.0° to 221.0°F
–5.0° to 105.0°C,
22.0° to 221.0°F
–5.0° to 105.0°C,
22.0° to 221.0°F
Temperature compensationAutomatic or manualAutomatic or manualAutomatic or manual
Data points5000 with date and time stamp1000 with date and time stamp50
Data export optionsRS232, USBRS232, USB---
Power supply4 AA batteries: 800 hrs. battery life (included) or optional universal, 100–240 VAC (sold separately)4 AA batteries: 800 hrs. battery life (included) or optional universal, 100–240 VAC (sold separately)4 AA batteries: 2,000 hrs. battery life (included) or optional universal, 100–240 VAC (sold separately)
  Enhance your productivity with accessories for your benchtop and portable meters. Meter Accessories ›
 

Advanced

Basic

 Eutech pH2700 pH Bench MeterEutech 1710 pH Bench Meter
 
 Economical, routine laboratory metersBudget-friendly, simple laboratory meters
pH range-2.000 to 20.000-2.00 to 18.00
pH resolution0.001 / 0.01 / 0.10.01
pH calibration pointsUp to 6Up to 5
mV, RmV modesYesYes
ORP modeYesYes
Temperature range0.0 to 100.0 °C, 32.0 to 212.0 °F-5.0 to 105.0 °C
Backlit displayYesYes
Onscreen text promptsBasic calibration and setup promptsBasic calibration and setup prompts
Number of channels11
Data log500 with date/time100
Calibration logMost recent viewable on meter and stored in meter memoryActive pH, RmV, temperature with time and date
Data export optionsRS232Computer or printer
Power supplyUniversal, 100-240VAC, 50/60 Hz, Cat. No. 60X426401Universal, 100–240VAC, 50–60Hz (Cat. No. EB1700PWR), 9 DC adapter, 1.3A

Watch the video and learn more.

Features & Benefits of the Eutech 1710 pH/mV Bench Meter

 

Premium

Advanced

Advanced

Basic

Basic

 

Eutech pH 450 Portable Meter

Eutech pH 150 Portable Meter

Eutech pH 600 Series Portable Meter

Eutech pH 6+ Portable Meter

Eutech pH 5+ Portable Meter

 
 
pH range-2.00 to 16.00-2.00 to 16.00-2.00 to 20.000.00 to 14.000.00 to 14.00
pH resolution0.01 pH0.01 pH0.1 / 0.01 Ph0.01 pH0.01 pH
pH relative accuracy±0.01 pH±0.01 pH±0.01 pH±0.01 pH±0.01 pH
pH calibration pointsUp to 6Up to 5Up to 6Up to 3Up to 3
mV modeYesYesYesYes---
ORP mode------YesYes---
Backlit displayYes---Yes------
Range (temperature)-10.0 to 110.0 °C (14.0 to 230.0 °F)-10.0 to 110.0 °C (14.0 to 230.0 °F)-10.0 to 110.0 °C (14.0 to 230.0 °F)0.0 to 100.0 C0.0 to 100.0 C
Onscreen test promptsBasic calibration and setup promptsBasic calibration and setup promptsBasic calibration and setup promptsBasic calibration and setup promptsBasic calibration and setup prompts
Temperature compensationAutomatic or manualAutomatic or manualYesAutomatic or manualAutomatic or manual
Data points500 with date and time stamp150500 with date and time stamp------
Data export optionsUSB or RS232---RS232C through LED, IrDA------
Power supplyTwo AA batteries (included) / 9 V DC adapter, 1.3 A (100/240 VAC, SMPS) (optional)Two AA batteries (included) / 9 V DC adapter, 1.3 A (100/240 VAC, SMPS) (optional)Four AA batteries (included) / 9 V DC adapter (500 mA)4 x AAA batteries4 x AAA batteries

Browse additional pH/ORP products

Meter Accessories

find the right benchtop meter for your pH and ORP measurement needs

Shop our comprehensive range of meter accessories designed to boost productivity, safeguard your investment and ensure optimal performance. Our assortment of accessories for bench and portable meters helps streamline your workflow while enhancing your user experience.

Electrodes and Probes

Electrodes, probes, and sensors for use with conductivity meters

Obtain accurate results with electrodes and probes developed to support the requirements of your sample testing. Choose from a wide variety of parameters, body materials, body styles, fill types, reference systems, junctions and more to meet the needs of your application.

Standards and Solutions

Orion standards and solutions

Ensure the reliability of your measurements with our premium buffers and solutions. Our high-quality calibration and maintenance solutions are essential for precise and consistent results. Shop a variety of buffers, buffer kits, electrode filling solutions, electrode storage solutions and more.


Award-Winning Orion Lab Star pH Bench Meter

The Thermo Scientific Orion Lab Star PH111 pH/mV Bench Meter is ideally suited for laboratories with users of varying levels of technical expertise and who require a simple-to-calibrate and use meter for routine pH testing. See why they're the preferred choice for laboratory professionals- named “Best New General Lab Product”, Scientists’ Choice Awards 2023. Watch this video to explore the features available with the Orion Lab Star pH/mV Bench Meter.


pH measurement videos

Measuring pH in drinking water using the Thermo Scientific Orion Versa Star Pro benchtop meter.

Calibrating a Thermo Scientific Orion Star A series pH benchtop meter.

Discover the Thermo Scientific Lab Star Series of Bench Meters for measuring pH, conductivity and dissolved oxygen.

Watch a pH meter calibration using the Orion Lab Star PH111 pH/mV Bench Meter.


Support

Validation and qualification (IQ/OQ) services for Thermo Scientific Orion bench and portable meters are currently available through Unity Lab Services in the United States ›

Knowledge Base: Certificates of Analysis and SDS for Orion, ROSS, AQUAfast, AquaMate, and AquaSensors products.

Orion Meters Software and Upgrades
Thermo Scientific Orion benchtop and portable meters are designed to help deliver accurate, consistent results, day after day. Boost productivity by upgrading your software today.

Find your software

Style Sheet for Global Design System
Style Sheet for Global Design System