Our benchtop pH and ORP (Oxidation-Reduction Potential) meters are designed to address a variety of measurement requirements for dependable performance, accuracy, and reproducibility. Identify the best match based on your required features, performance specifications, and budget.
Premium | Advanced | Basic | |
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Orion Versa Star Pro pH Benchtop Meter (VSTAR10 series) |
Orion Star A211 pH Benchtop Meter (STARA211 series) |
Orion Star A111 pH Benchtop Meter (STARA111 series) |
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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 20.000 |
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 3 |
pH calibration modes | Auto buffer recognition with option to edit values | Auto buffer recognition with option to edit values | Auto buffer recognition or manual buffer entry |
Automatic buffer sets | USA/NIST, DIN or custom | USA/NIST or DIN | USA/NIST or DIN |
mV, RmV modes | YES | YES | YES |
mV, RmV modes | YES | YES | — |
ORP mode | YES | YES | — |
Display type | Adjustable color graphic LCD | Graphic LCD | Fixed segment LCD |
Backlit display | 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 |
Keypad | Numeric with menu-specific function keys | Comprehensive with menu-specific function keys | Simple with highlighted measure key |
Number of channels | 4, customizable with modules | 1 | 1 |
Included modules | 1 x VSTAR-PH | — | — |
Stirrer probe inputs | 2 | 1 | — |
Measure read modes | Auto-read, continuous, timed, single-shot | Auto-read, continuous, timed | Auto-read, continuous |
Methods | 10 per channel | 10 | — |
Data log | 2000 with date/time | 2000 with date/time | 50 |
Calibration log | 30 per mode | 10 | — |
Identification options | Electrode ID, sample ID, user ID | Sample ID, user ID | — |
Alarms | Set point, high/low limit, calibration due | High/low limit, calibration due | — |
External device output | USB(2), RS232 | USB, RS232 | — |
Certifications | IP-54, CE, TUV 3-in-1, FCC Class A | IP-54, CE, TUV 3-in-1, FCC Class A | IP-54, CE, TUV 3-in-1, FCC Class A |
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) or 4 AA batteries |
The accuracy and reliability of your measurements depend on the instrumentation you use. Learn more about the other products offered as part of this portfolio
Portable pH and ORP Meters | pH Electrodes and Probes | Buffers and Solutions |
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Our portable pH meters are designed to offer simple and accurate pH measurements for your on-the-go measurements. | Our extensive assortment of quality pH electrodes, sensors, and probes are available in a variety of body materials, body styles, and sample requirements. | We offer a variety of NIST traceable pH buffer solutions, pH electrode storage solutions, electrode cleaning solutions, lab buffer kits, and electrode filling solutions for every application. |