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Thermo Scientific™ Orion Star™ A121 Portable pH Meter

Take simple pH and temperature measurements with our portable pH meter with easy operation for basic field testing.

$731.00 - $1232.00


Measurement Modes pH, mV or relative mV with temperature
Calibration pH, relative mV (RmV) and temperature
Range (pH) -2 to 16
Resolution (pH) 0.01, 0.1
Accuracy (pH) ±0.01
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Products 2
Catalog Number Mfr. No. Description Includes Price Quantity & Availability  
Catalog Number Mfr. No. Description Includes Price Quantity & Availability  
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Thermo Scientific™
Orion Star A121 portable pH meter Star A121 pH meter, 4 AA batteries
Each for $731.00
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Accessories View Documents
Thermo Scientific™
Orion Star A121 portable pH meter standard kit with general purpose pH/ATC electrode Star A121 pH meter, 9107BNMD gel-filled epoxy-body pH/ATC electrode, 916099 pH buffer kit, protective meter armor, hard-sided carrying case, 4 AA batteries
Each for $1,232.00
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Take simple, routine pH, mV and temperature measurements with the Thermo Scientific™ Orion Star™ A121 Portable pH Meter. This meter is an easy-to-use and budget-friendly instrument for basic pH analysis in the field. Perform up to a 3 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.

Thermo Scientific Orion Star A121 Portable pH Meters are a simple, economical solution for your routine outdoor sample analysis. Featuring an emphasized measure key, selectable read modes and measurement stability indicator, our basic Orion Star A121 pH Meters are designed to deliver measurements you can trust at an affordable price.
  • Measure pH, mV or relative mV with temperature
  • Perform up to a 3 point pH calibration with automatic buffer recognition or manual buffer entry
  • Simplified, easy-to-read display shows main measurement with temperature, stability indicator and electrode condition icon
  • User-friendly operation with basic calibration text prompts
  • Easily recall calibration data for procedure checks
  • Non-volatile memory preserves 50 point internal data log and meter settings, even with loss of power
  • Flexible power options with AA batteries or optional universal power adapter
  • IP67-rated housing is waterproof for rugged field operation
  • Meter kits include hard-sided field case and protective meter armor with electrode holders, adjustable wrist/belt strap and built-in meter stand
  • Meters offer CE, TUV 3-in-1 and FCC Class A certifications
  • 3-year replacement warranty

Disclaimer to internal research use restriction: Any restrictions on the purchaser to utilize the product(s) for internal research purposes only does not apply to the product(s) on the web pages associated with this statement.



pH, mV or relative mV with temperature
-2 to 16
1 to 3
22.0°F to 221.0°F
1 point temperature offset calibration
Non-volatile memory preserves log and settings
Automatic with Auto-Read Measure Mode, Manual with Continuous Measure Node
BNC (pH or ORP electrode), 8 pin MiniDIN (ATC temperature probe)
CE, TUV 3-1, FCC Class A
Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
0.5 kg
3 Year Meter Warranty
Orion Star A121 Portable pH/mV/RmV/Temperature Meter
5 to 85%, non-condensing
Smart Stability and Smart Averaging
5°C to 45°C (ambient)
4 x AA
pH, relative mV (RmV) and temperature
0.01, 0.1
±0.2 or ±0.05%, whichever is greater
-5°C to +105°C
0.1°C, 0.1°F
Manual or automatic with ATC temperature probe
Internal Data Point Memory
24 cm x 10 cm x 6.5 cm (9.5 in. x 3.9 in. x 2.6 in.)
2 lb.
Simple with highlighted measure key, scroll and shortcut keys
Universal AC adapter (included) or 4 AA batteries (sold separately)
41°F to 113°F (ambient)
2000 hr.
Product Certifications
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