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Thermo Scientific™ Orion Star™ A121 pH Portable Meter

Take simple pH and temperature measurements with the Thermo Scientific™ Orion™ Star A121 pH Portable Meter with easy operation for basic field testing

Manufacturer:  Thermo Scientific™ STARA1215

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Catalog No. 13-645-506

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Take simple, routine pH, mV and temperature measurements with the Thermo Scientific™ Orion™ Star A121 pH Portable Meter, an easy-to-use and budget-friendly instrument for basic pH analysis in the field. 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. This waterproof meter has an IP67-rated housing for rugged protection in outdoor environments.

  • Large, informative screen clearly shows the main information, including pH or mV reading, temperature in °C or °F, meter mode, calibration information and battery life.
  • Thermo Scientific™ AUTOREAD™ locks in the stable reading on your screen and indicator alerts user when readings are stable.
  • Meter includes up to three point pH calibration and automatic recognition of USA/NIST™ and DIN buffers.
  • User can easily recall calibration slope data for procedure checks.
  • Nonvolatile memory holds up to 50 data points.
  • Four AA batteries (included) provide more than 2,000 hours of operation or purchase the universal power adapter (sold separately) to run meter on AC power.
  • Meter is perfectly portable, waterproof and protected to take anywhere with a IP67-rated housing.
Description & Specifications


Orion Star A121 pH portable meter kit with Triode pH/ATC electrode, solutions, meter armor and field case
Orion Star A121 pH portable meter kit with Triode pH/ATC electrode, solutions, meter armor and field case
-2.00 to 16.00pH
±0.2 mV or ±0.05% of reading whichever is greater
1 to 3
0.1°C, 0.1°F
Manual or automatic with ATC temperature probe
Simple with highlighted measure key, scroll and shortcut keys
Smart Stability and Smart Averaging
Non-volatile memory preserves log and settings
BNC (pH or ORP electrode), 8 pin MiniDIN (ATC temperature probe)
pH electrode, ORP electrode, ATC temperature probe (includes 9107BNMD Orion Triode pH/ATC electrode)
Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
Four AA (included)
CE, TUV 3-1, FCC Class A
5° to 45° C (ambient)
24cm x 10cm x 6.5cm (9.5 in. x 3.9 in. x 2.6 in.)
Orion Star A121 pH/mV/RmV/Temperature Portable Meter
Star A121 pH meter, 9107BNMD Orion Triode gel-filled epoxy-body pH/ATC electrode, 916099 pH buffer and solution kit, protective meter armor, hard-sided field case, 4 AA batteries, literature CD, printed quick start guide and meter test certificate
0.1, 0.01pH
pH, relative mV (RmV) and temperature
1 point relative mV (RmV) mode
-5.0° to 105.0° C, 22.0° to 221.0° F
1 point temperature offset calibration
pH, mV or relative mV (RmV) with temperature
Internal data point memory
Automatic data logging with Auto-Read measure mode; manual data logging with Continuous measure mode
4 AA batteries (included) or universal AC adapter (sold separately)
2000 hours
41° to 113°F (ambient)
5 to 85 %, non-condensing
2 lb.
3 year meter warranty
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