Meters from economical and simple to robust and modular

High-quality meters are essential to the critical, routine tasks you perform every day. Our portfolio of benchtop and portable dissolved oxygen meters are designed to help you meet your sample analysis challenges with speed and confidence.

Meet your regulatory needs with technology that is ideal for a wide range of applications and advanced dissolved oxygen analysis in the lab. Orion advanced and premium benchtop meters offer the flexibility to measure both polargraphic and optical technology. A dedicated kit, complete with BOD stirrer probe needed to fit in a DO bottle for airtight incubation, is available with the Orion Star A213 meter.

Calibrate using water-saturated air, air-saturated water, or custom value, using Winkler titration or zero point options. Log up to 2,000 data point sets with time/date stamp, and easily transfer calibration and data logs via USB or RS232 to a printer or computer when using an Orion advanced or premium dissolved oxygen meter. 





 Orion Versa Star Pro RDO/DO
(VSTAR30 series)
Orion Star A213 RDO/DO
(STARA2130 series)
Orion Star A113 DO
(STARA1130 series)
 Premium Orion benchtop  dissolved oxygen metersAdvanced Orion benchtop dissolved oxygen metersBasic Orion benchtop dissolved oxygen meters
 Versatile, high-performance laboratory measurement system Easy-to-use, dependable laboratory metersEconomical, simplified
laboratory meters
Ideal for
applications in:
Pharmaceuticals, biotechnology, food and beverage, industrialWater, 
chemical, contract testing
Compatible probes RDO, polarographicRDO, polarographic Polarographic 
DO range (polarographic) 0 to 90 mg/L, 0 to 600% 0 to 90 mg/L, 0 to 600% 0 to 20 mg/L, 0 to 200% 
DO range (RDO optical) 0 to 50 mg/L, 0 to 500% 0 to 50 mg/L, 0 to 500% --- 
DO calibration modes Water-saturated air, air-saturated water, manual (Winkler), zero point Water-saturated air, air-saturated water, manual (Winkler), zero point Water-saturated air, manual (Winkler) 
Barometric pressure compensation Automatic with built-in barometer Automatic with built-in barometer Automatic with manual value input 
Salinity correction Automatic with conductivity module and probe or manual input Automatic with manual factor input Automatic with manual factor input 
Display typeAdjustable color graphic LCDGraphic LCDFixed segment LCD
Backlit display  Yes Yes --- 
Onscreen text promptsStep-by-step calibration and guided setup instructionsStep-by-step calibration and guided setup instructionsBasic calibration and setup prompts
KeypadNumeric with menu-specific function keysComprehensive with menu-specific function keysSimple with highlighted measure key
Number of channels 4, customizable with modules11
Included modules1 x VSTAR-RD------
Stirrer probe inputs21---
Measurement read modesAuto-read, continuous, timed, single-shotAuto-read, continuous, timedAuto-read, continuous
Methods10 per channel10---
Data log2,000 with date/time2,000 with date/time50
Calibration log30 per mode101
Identification optionsElectrode ID, sample ID, user IDSample ID, user ID---
AlarmsSet point, high/low limit, calibration dueHigh/low limit, calibration due---
External device outputUSB (2), RS232USB, RS232---
CertificationsIP-54, CE, TUV 3-in-1, FCC Class AIP-54, CE, TUV 3-in-1, FCC Class AIP-54, CE, TUV 3-in-1, FCC Class A
Power supplyUniversal, 1000150–240 VAC, 50–60 Hz (Cat. No. STARA-PWR)Universal, 100–240 VAC, 50–60 Hz (Cat. No. 1010003) or 4 AA batteries Universal, 100–240 VAC, 50–60 Hz (Cat. No. 1010003) or 4 AA batteries 
  Enhance your productivity with accessories for your benchtop and portable meters. Meter Accessories ›

Complete your dissolved oxygen (DO) measurements faster

We offer a range of dissolved oxygen (DO) measurement instrumentation and accessories designed to meet your standards for performance and price. Our DO meters, DO probes, and standards are designed to offer maximum repeatability and accuracy in your DO readings.

Dissolved Oxygen (DO)
Portable Meters

Dissolved oxygen portable meters

Bring the lab outdoors with portable meters for dependable performance in the field. High-quality meters are essential to the critical, routine measurements you perform every day. We offer a wide range of Dissolved Oxygen (DO) meters for your measurement needs, performance specifications, and budgetary constraints.

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Electrodes & Probes

dissolved oxygen electrodes and probes

Perform accurate and reproducible measurements in any application. Our wide selection of electrochemical probes, sensors, and electrodes are designed to make your complex measurements routine, reliable, and accurate—in the lab or in the field. Available in a variety of body materials, body styles, and sample requirements.

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Buffers and Solutions

buffers and solutions

Using high-quality, fresh solutions to calibrate and maintain your electrodes, probes, and sensors is an essential part of good laboratory practices. Having fresh Thermo Scientific Orion solutions available for your routine calibration needs is the best way to ensure your data is both accurate and reproducible when accuracy is critical.

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Knowledge Base: Certificates of Analysis and SDS for Orion, ROSS, AQUAfast, AquaMate, and AquaSensors products.

Orion Meters Software and Upgrades
Thermo Scientific Orion benchtop and portable meters are designed to help deliver accurate, consistent results, day after day. Boost productivity by upgrading your software today.

Find your software