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pH & ORP Meters
Meet your pH and ORP sample analysis challenges in the lab or in the field
Whether you're looking for a simple pH meter on a budget, or a powerful pH meter that simultaneously measures other parameters, our pH meters are designed to help you tackle even the most complex pH measurements with confidence. We offer simple, complete systems that are seamlessly integrated to help address your measurement needs both in the field and in the lab.
Whether working in food and beverage, pharmaceuticals, energy and power, education, government, or water and wastewater management, you can count on Thermo Scientific Orion pH/ORP meters to help you meet regulatory standards, help ensure quality control protocols are met, and accelerate your path from challenge to solution. Learn more about the regulatory requirements supported by our benchtop and portable meters.
Browse our complete portfolio or let one of our experts help you make a selection.
Select your pH and ORP bench or portable meter
Premium | Advanced | Basic | |
|---|---|---|---|
| Orion Versa Star Pro pH Bench Meter (VSTAR10 series) | Orion Star A211 pH Bench Meter (STARA211 series) | Orion Lab Star pH111 pH Bench Meter (Lab Star series) | |
 |  |  | |
| Versatile, high-performance laboratory measurement system | Easy to use, dependable laboratory meters | Economical, simplified laboratory meters | |
| Ideal for applications in: | Pharmaceuticals, biotechnology, food and beverage, industrial | Water, wastewater, chemical contract testing | Academic, environmental, power |
| pH range | –2.000 to 20.000 | –2.000 to 20.000 | –2.000 to 18.000 |
| pH resolution | 0.001 / 0.01 / 0.1 | 0.001 / 0.01 / 0.1 | 0.001 / 0.01 / 0.1 |
| pH calibration points | Up to 6 | Up to 5 | Up to 5 |
| mV, RmV modes | Yes | Yes | Yes |
| ORP mode | Yes | Yes | Yes |
| Temperature Range | -5 to 105°C 22 to 221°C | -5 to 105°C 23 to 221°C | -5 to 105°C 23 to 221°C |
| Backlit display | Yes | Yes | Yes |
| Onscreen text prompts | Step-by-step calibration and guided setup instructions | Step-by-step calibration and guided setup instructions | Basic calibration and setup prompts |
| Number of channels | 4, customizable with modules | 1 | 1 |
| Stirrer probe inputs | 2 | 1 | — |
| Data log | 2000 with date/time | 2000 with date/time | 500 |
| Calibration log | 30 per mode | 10 | — |
| Identification options | Electrode ID, sample ID, user ID | Sample ID, user ID | 1 |
| Data export options | Computer or printer | Computer or printer | Computer or printer |
| Power supply | Universal, 100–240 VAC, 50-60 Hz Cat. No. STARA-PWR) | Universal, 100–240 VAC, 50–60 Hz (Cat. No. 1010003) or 4 AA batteries | Universal, 100–240 VAC, 50–60 Hz (Cat. No. 1010003), 9 DC adapter, 1.3A |
| Increase your productivity by adding accessories to your benchtop or portable meter. Meter Accessories › | |||
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 rugged, easy-to-use portable field meters | Advanced portable meters, easy-to-use, dependable field meters | Basic portable meters, budget-friendly, simplified field meters | |
| Ideal for applications in: | pH, mV, ORP, and temperature testing, and field applications | Advanced pH analysis ideal for outdoor environments and field applications | IP67-rated housing for rugged protection in outdoor environments |
| pH range | –2.000 to 20.000 pH | –2.000 to 20.000 pH | 2.00 to 16.00 pH |
| pH resolution | 0.1. 0.01, 0.001 pH | 0.1. 0.01, 0.001 pH | 0.1. 0.01 pH |
| pH relative accuracy | ±0.002 pH | ±0.002 pH | ±0.01 pH |
| pH calibration points | Up to 5 | Up to 5 | Up to 3 |
| mV mode | Yes | Yes | Yes |
| ORP mode | Yes | Yes | No |
| 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 compensation | Automatic or manual | Automatic or manual | Automatic or manual |
| Data points | 5000 with date and time stamp | 1000 with date and time stamp | 50 |
| Data export options | RS232, USB | RS232, USB | --- |
| Power supply | 4 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 › | |||
Premium | Advanced | Basic | |
|---|---|---|---|
| Orion Versa Star Pro pH Bench Meter (VSTAR10 series) | Orion Star A211 pH Bench Meter (STARA211 series) | Orion Lab Star pH111 pH Bench Meter (Lab Star series) | |
| | | |
| Versatile, high-performance laboratory measurement system | Easy to use, dependable laboratory meters | Economical, simplified laboratory meters | |
| Ideal for applications in: | Pharmaceuticals, biotechnology, food and beverage, industrial | Water, wastewater, chemical contract testing | Academic, environmental, power |
| pH range | –2.000 to 20.000 | –2.000 to 20.000 | –2.000 to 18.000 |
| pH resolution | 0.001 / 0.01 / 0.1 | 0.001 / 0.01 / 0.1 | 0.001 / 0.01 / 0.1 |
| pH calibration points | Up to 6 | Up to 5 | Up to 5 |
| mV, RmV modes | Yes | Yes | Yes |
| ORP mode | Yes | Yes | Yes |
| Temperature Range | -5 to 105°C 22 to 221°C | -5 to 105°C 23 to 221°C | -5 to 105°C 23 to 221°C |
| Backlit display | Yes | Yes | Yes |
| Onscreen text prompts | Step-by-step calibration and guided setup instructions | Step-by-step calibration and guided setup instructions | Basic calibration and setup prompts |
| Number of channels | 4, customizable with modules | 1 | 1 |
| Stirrer probe inputs | 2 | 1 | — |
| Data log | 2000 with date/time | 2000 with date/time | 500 |
| Calibration log | 30 per mode | 10 | — |
| Identification options | Electrode ID, sample ID, user ID | Sample ID, user ID | 1 |
| Data export options | Computer or printer | Computer or printer | Computer or printer |
| Power supply | Universal, 100–240 VAC, 50-60 Hz Cat. No. STARA-PWR) | Universal, 100–240 VAC, 50–60 Hz (Cat. No. 1010003) or 4 AA batteries | Universal, 100–240 VAC, 50–60 Hz (Cat. No. 1010003), 9 DC adapter, 1.3A |
| Increase your productivity by adding accessories to your benchtop or portable meter. Meter Accessories › | |||
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 rugged, easy-to-use portable field meters | Advanced portable meters, easy-to-use, dependable field meters | Basic portable meters, budget-friendly, simplified field meters | |
| Ideal for applications in: | pH, mV, ORP, and temperature testing, and field applications | Advanced pH analysis ideal for outdoor environments and field applications | IP67-rated housing for rugged protection in outdoor environments |
| pH range | –2.000 to 20.000 pH | –2.000 to 20.000 pH | 2.00 to 16.00 pH |
| pH resolution | 0.1. 0.01, 0.001 pH | 0.1. 0.01, 0.001 pH | 0.1. 0.01 pH |
| pH relative accuracy | ±0.002 pH | ±0.002 pH | ±0.01 pH |
| pH calibration points | Up to 5 | Up to 5 | Up to 3 |
| mV mode | Yes | Yes | Yes |
| ORP mode | Yes | Yes | No |
| 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 compensation | Automatic or manual | Automatic or manual | Automatic or manual |
| Data points | 5000 with date and time stamp | 1000 with date and time stamp | 50 |
| Data export options | RS232, USB | RS232, USB | --- |
| Power supply | 4 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 › | |||
Explore versatile meters that combine testing capabilities
Measure pH, ion concentration, conductivity, dissolved oxygen, and temperature with a single, powerful meter. Our bench and portable multiparameter meters are designed to increase your productivity in the lab and in the field.
Meter accessories
Bench meter and portable meter accessories make help protect you and your instruments by simplifying repetitive tasks and providing secure storage and transportation.
View all meter accessories ›
Parameter | EPA | SM | ASTM | ISO | China MEP | USP | EP | AOAC | Other |
|---|---|---|---|---|---|---|---|---|---|
pH | EPA 150.1 | 4500-H+(B) | D1293 (A,B) | 10523 | GB/T 6920 | <791> | 2.2.3 | 973.41 | FDA - 21 CFR 114.90 |
pH of soil/solid waste | SW-846 9040C & 9045D | D4972 | 10390 | GB/T15555 | 994.16 - 994.18 | USDA NRCS | |||
Conductivity | EPA 120.1; SW-846 9050A | 2510 (B) | D1125 (A) | 7888 | n/a | <645> | 2.2.38 | 973.40 | PSS-78 (salinity) |
Dissolved oxygen | 4500-O (G) | D888 (B, C) | 17289; 5814 | HJ506 | |||||
BOD | 5210 (B) | 5815 | HJ505 | 973.44 | |||||
Fluoride | SW-846 9214 | 4500-F (C ) | D1179 (B) | 10359 | GB7484 | ||||
Ammonia | 4500-NH3 (D, E) | D1426 (B) | 6778 | ||||||
Nitrate | Orion 601; SW-846 9210A | 4500-NO3 (D) | |||||||
Sulfide | SW-846 9215 | 4500-S2 (G) | D4658 | ||||||
Cyanide | SW-846 9213 | 4500-CN (F) | D2036 (A) | ||||||
Chloride | SW-846 9212 | 4500-Cl (D) | D512 (C) | GB11896 | |||||
Bromide | SW-846 9211 |
| SM: Standard Methods for the Examination of Water and Wastewater. APHA, AWWA, WEF. | |
| ASTM: American Society for Testing and Materials | |
| ISO: International Organization for Standardization | |
| USP: United States Pharmacopeia | |
| EP: European Pharmacopeia | |
| China MEP: China Ministry of Environmental Protection | |
| AOAC: Association of Official Analytical Chemists | |
| NRCS: Natural Resources Conservation Service | |
| PSS-78: Practical Salinity Scale of 1978 | |
| FDA: US Food and Drug Administration | |
| USDA: US Department of Agriculture |
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.
See our complete list of pH and ORP measurement offerings
Thermo Scientific Pocket Testers are ideal for on-the-go electrochemical testing.
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Quality pH electrodes, standards and solutions are available for a variety of body materials, body styles, fill types, references styles, and functions to meet your needs. |
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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.
Style Sheet for Global Design System
Style Sheet for Global Design System