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Thermo Scientific™ Orion Star™ A123 Dissolved Oxygen Portable Meter

Take simple dissolved oxygen and temperature measurements with this portable meter with easy operation for basic field testing.

Supplier:  Thermo Scientific™ STARA1235

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Catalog No. 13-645-518

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Take simple, routine dissolved oxygen and temperature measurements with the Thermo Scientific™ Orion Star™ A123 Dissolved Oxygen Portable Meter. This instrument is easy-to-use and budget-friendly, designed for basic dissolved oxygen analysis in the field. Calibrate polarographic DO probes using water-saturated air or custom value using Winkler titration. 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.

Thermo Scientific Orion Star A123 dissolved oxygen portable 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 A123 dissolved oxygen meters are designed to deliver measurements you can trust at an affordable price.
  • Measure dissolved oxygen in percent saturation or mg/L with temperature using polarographic DO probes
  • Calibrate using water-saturated air or custom value (Winkler titration)
  • Automatically compensate DO readings using ATC temperature, manual salinity input and manual barometric pressure
  • 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 and 3-year replacement warranty


Orion Star A123 dissolved oxygen portable meter kit with polarographic DO sensor, maintenance kit, meter armor and field case
Dissolved Oxygen (% Saturation), Dissolved Oxygen (mg/L with Temperature)
0.00 to 20.00mg/L
0.01, 0.1mg/L
450 to 850mmHg (manual entry)
0.0°C to 50.0°C
1 point temperature offset calibration
Non-volatile memory preserves log and settings
Automatic data logging with Auto-Read measure mode; manual data logging with Continuous measure mode
9 pin MiniDIN (polarographic DO sensor with built-in temperature)
24 cm x 10 cm x 6.5 cm (9.5 in. x 3.9 in. x 2.6 in.)
2 lb.
3 Year Meter Warranty
Simple with highlighted measure key, scroll and shortcut keys
Orion Star A123 Dissolved Oxygen/Temperature Portable Meter
±2 % saturation or ±2% of reading whichever is greater
Polarographic dissolved oxygen probe (includes 083005MD Orion polarographic DO sensor)
0 to 45 ppt, automatic correction using manual entry of sample salinity
41°F to 113°F (ambient)
2000 hours
450 to 850mmHg, automatic with manual entry
Star A123 DO meter, 083005MD Orion polarographic dissolved oxygen sensor, 080513 DO maintenance kit, protective meter armor, hard-sided field case, 4 AA batteries, literature CD, printed quick start guide and meter test certificate
Polarographic dissolved oxygen sensor
0.0 to 200.0 % saturation
±0.2mg/L or ±2% of reading, whichever is greater
Water-saturated air, manual (Winkler titration)
0.1°C (0.1°F)
Automatic with ATC temperature probe
Internal data point memory
CE, TUV 3-1, FCC Class A
Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003)
0.5 kg
5 to 85 %, non-condensing
0.0 to 200.0 % saturation
0.1, 1 % saturation
4 AA batteries (included) or universal AC adapter (sold separately)
Smart Stability and Smart Averaging
5°C to 45°C (ambient)
Four AA (included)
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