• Benchtop pH Meter

Benchtop pH Meter

  • pH, mV and temperature
  • Offers up to three point pH calibration and automatic recognition of USA/NIST and DIN buffers
  • Use can easily recall calibration slope data for procedure checks

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Take simple, routine pH, mV and temperature measurements with the Thermo Scientific Orion Star A111 pH Benchtop Meter, an easy-to-use and budget-friendly instrument for basic pH analysis in the lab

Perform up to a three point pH calibration with easy recall of calibration points and slope. Quickly navigate setup menus and ensure consistent calibrations using the simple keypad layout and on-screen text prompts. Use the included electrode stand to easily place sensors in samples and simplify storage to minimize breakage.


  • Large, informative screen clearly shows the main information, including pH or mV reading, temperature, meter mode, calibration information and power source.
  • Thermo Scientific™ AUTO-READ™ locks in the stable reading on your screen and ready indicator alerts when readings are stable
  • Meter offers up to three point pH calibration and automatic recognition of USA/NIST and DIN buffers.
  • Use can easily recall calibration slope data for procedure checks.
  • Nonvolatile memory holds up to 50 data points.
  • Included electrode arm and newly designed probe holder make it easier to maintain and place probes into samples.
  • Plug the meter into almost any power outlet with the included universal power adapter or use four AA batteries (sold separately) to run the meter on DC power.
  • The IP54-rated housing can handle splashes and can be wall-mounted if table space is a problem.
Operating Temperature 41° to 113°F (ambient)
5° to 45°C (ambient)
Stability Smart Stability and Smart Averaging
Resolution (Temperature) 0.1°C, 0.1°F
Temperature Range  22.0° to 221.0° F
-5.0° to 105.0° C
Temperature Probe Calibration 1 point temperature offset calibration
Warranty 3 year meter warranty
Weight 2 lb.
Temperature Selection Manual or automatic with ATC temperature probe
AC Adapter Universal 50-60 Hz, 100-240 VAC power adapter (Cat. No. 1010003)
Accuracy (pH) ±0.01pH
Accuracy (mV) ±0.2 mV or ±0.05% of reading whichever is greater
Accuracy (Temperature) ±0.1°C
Battery Life 2000 hr.
Battery Type 4 x AA (sold separately)
Calibration pH, relative mV (RmV) and temperature
Calibration Points 1 point relative mV (RmV) mode
Data Management Details Internal data point memory
Channels 1
Certifications/Compliance CE, TUV 3-1, FCC Class A
Description Orion Star A111 pH benchtop meter with stand
Languages English
Log Function Type Automatic data logging with Auto-Read measure mode; manual data logging with Continuous measure mode
Dimensions (L x W x H) 24cm x 18cm x 11cm (9.5 in. x 7.1 in. x 4.3 in.)
Data Points 50
Display Type LCD
Resolution (pH) 0.1, 0.01
Range (pH) -2.00 to 16.00
Includes Star A111 pH meter, electrode stand, universal power adapter, literature CD, printed quick start guide and meter test certificate
IP Rating IP-54
Inputs BNC (pH or ORP electrode), 8 pin MiniDIN (ATC temperature probe)
Isopotential Point 7.00pH
Keypad Simple with highlighted measure key, scroll and shortcut keys
Memory Non-volatile memory preserves log and settings
Measurement Modes pH, mV or relative mV (RmV) with temperature
Model Orion Star A111 pH/mV/RmV/Temperature Benchtop Meter
Outputs None
Probe Type pH electrode, ORP electrode, ATC temperature probe (purchase separately)
Power Supply Universal AC adapter (included) or 4 AA batteries (sold separately)
Range (Relative mV) ±1999.9mV
Relative Humidity Range 5 to 85%, non-condensing
Resolution (mV) 0.1mV
Range (mV) ±1600.0mV