Pentagram
Computer Controlled Three Dimensions (31) Physics
Ensure accurate and reliable measurements in your laboratory and research locations

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.

Which benchtop pH and ORP meter is right for you?
Premium Advanced Basic
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)
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
Confidence in your pH measurements

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
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.
Featured pH measurement videos

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