Thermo Scientrific Orion STAR A326 pH / RDO / Dissolved Oxygen Meter
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  • Memory holds up to 5000 data points
  • Up to 5 point pH calibration
  • Measures DO in % saturation or concentration
  • Fix pH calibration errors without a complete recalibration
  • Four AA batteries (included) over 800 hours of operation
  • Temperature Range: 32 to 122ºF (0 to 50°C)
  • IP67-rated housing
  • 3 year meter replacement warranty

The Thermo Scientific Orion STAR A326 pH/RDO/Dissolved Oxygen Portable Meter is the top choice for advanced measurements on location. Get the information you need quickly and easily from the large, backlit graphic LCD display. The informative display shows individual pH/mV/ RmV or dissolved oxygen in percent saturation or concentration results with temperature, or all results at once. Additional helpful information include electrode status, time, date, sample ID, user ID and calibration points. Advanced features such as stability and averaging options provide additional options allowing for laboratory accuracy everywhere you need it.

Anyone can use this meter with its plain language screen prompts, soft keys that update for easy selection and a multilanguage interface that supports English, Spanish, French, Italian, German and Chinese. The AUTO-READ™ capability locks in the stable reading on your screen, the ready indicator alerts when readings are stable and the timed reading gathers data in specific time intervals. The STARA326 has Up to 5 point pH calibration with automatic recognition for USA/NIST and DIN buffers.

Additional features include:

  • The meter accepts and automatically recognizes Orion polarographic and RDO optical/ luminescence-based probes
  • Easily get accurate DO results with automatic temperature, manual salinity and automatic/ manual barometric pressure correction
  • Calibrate DO using water-saturated air, air-saturated water, a Winkler titration or zero point calibration
  • Easily transfer data and keep meter software up-to-date with the USB and RS232 ports and complimentary data analysis software

The STAR A3265 pH/RDO/Dissolved Oxygen Portable Multiparameter Meter Kit includes:

  • 8107UWMMD Orion ROSS Triode 3-in-1 pH/ATC probe, 3m cable
  • 087010MD Orion RDO optical/luminescence-based probe with 3m cable, stainless steel guard, calibration sleeve and optical/luminescence-based cap
  • 910410 Orion pH 4.01 buffer, 10 pouches
  • 910710 Orion pH 7.00 buffer, 10 pouches
  • 911010 Orion pH 10.01 buffer, 10 pouches
  • 810001 Orion ROSS electrode storage solution, 475 mL
  • 01100710 Orion 1413 μS conductivity standard, 10 pouches
  • 911110 rinse solution, 10 pouches
  • Protective armor with electrode holder
  • Hard carrying case
  • Four AA batteries (installed)


Thermo Scientific Orion pH Electrodes
pH electrodes available in a variety of styles
In Stock
Thermo Scientific Orion ROSS pH Electrodes
The best performing pH electrodes on the market available in various sizes, tips and special features
Thermo Scientific Orion Dissolved Oxygen Probes
Dissolved oxygen probes for your Thermo Scientific Orion meter


Thermo Scientific Orion Dissolved Oxygen Calibration Accessories
Calibration accessories for Thermo Scientific Orion dissolved oxygen electrodes


Thermo Scientific Orion All-in-One 60mL pH Buffer Kit
kit including 4.01, 7.00 and 10.00 buffers pH electrode storage solution and pH electrode cleaning solution
Thermo Scientific Orion pH Buffers
pH buffers for Thermo Scientific Orion pH electrodes
Thermo Scientific Orion pH Electrode Cleaning Solutions
Cleaning solutions for Thermo Scientific Orion pH electrodes
Thermo Scientific Orion pH Electrode Storage Solutions
Storage solutions for Thermo Scientific Orion pH electrodes
Thermo Scientific Orion Dissolved Oxygen Solution
Polarographic electrolyte solution for Thermo Scientific Orion dissolve oxygen electrodes


Please consider these optional accessories.

Thermo Scientific Orion STARA-CS Carrying Case
Hard carrying case for the Orion A-series
Thermo Scientific Orion Armor
Orion Star A series portable meter protective armor with hand strap/built-in stand, storage sleeve, and holders
Thermo Scientific Orion STARA-ESCD Probe Holder
Conductivity and DO probe holder for use with armor, Orion Star A
Thermo Scientific Orion STARA-ESPH pH Electrode Holder
Holds one pH electrode in the pH electrode sleeve, can be attached to either side of the meter armor
Thermo Scientific Orion STARA-BEA Electrode Arm
Electrode Arm, Orion Star A, no base
Thermo Scientific Orion STARA-HB Base
Base, Orion Star A, for use with benchtop electrode arm