For dissolved oxygen measurements in the field
Our portable dissolved oxygen meters are the top choice for ensuring proper oxygen levels for maximum process control on location.
Take control of your DO sample measurements without changing the environment around you.
Premium | Advanced | Basic | |
|---|---|---|---|
| Orion Star A323 Dissolved Oxygen (STARA3230 series) | Orion Star A223 Dissolved Oxygen (STARA2230 series) | Orion Star A123 Dissolved Oxygen (STARA1230 series) | |
 |  |  | |
| Dependable and rugged field meters | Easy-to-use, waterproof field meters | Budget-friendly, simplified field meters | |
| Ideal for applications in: | Environmental, food and beverage, industrial | Chemical, water, wastewater | Academic, power |
| Range (polarographic concentration) | 0 to 90 mg/L | 0 to 90 mg/L | 0 to 20 mg/L |
| Resolution (polarographic concentration) | 0.01, 0.1 mg/L | 0.01, 0.1 mg/L | 0.01, 0.1 mg/L |
| Relative accuracy (polarographic concentration) | ±0.2 mg/L or ±2% of reading, whichever is greater | ±0.2 mg/L or ±2% of reading, whichever is greater | ±0.2 mg/L |
| Range (polarographic saturation) | 0 to 600% saturation | 0 to 600% saturation | 0 to 200% saturation |
| Resolution (polarographic saturation) | 0.1, 1% saturation | 0.1, 1% saturation | 0.1, 1% saturation |
| Relative accuracy (polarographic saturation) | ±2% saturation or ±2% of reading, whichever is greater | ±2% saturation or ±2% of reading, whichever is greater | ±2% saturation |
| Range (RDO concentration) | 0 to 50 mg/L | 0 to 50 mg/L | --- |
| Resolution (RDO concentration) | 0.01, 0.1 mg/L | 0.01, 0.1 mg/L | --- |
| Relative accuracy (RDO concentration) | ±0.1 mg/L up to 8 mg/L; ±0.2 mg/L from 8 to 20 mg/L; 10% of reading from 20 to 50 mg/L | ±0.1 mg/L up to 8 mg/L; ±0.2 mg/L from 8 to 20 mg/L; 10% of reading from 20 to 50 mg/L | --- |
| Range (RDO % saturation) | 0 to 500% saturation | 0 to 500% saturation | --- |
| Resolution (RDO % saturation) | 0.1, 1% saturation | 0.1, 1% saturation | --- |
| Relative accuracy (RDO % saturation) | ±2% sat. ≤ 200% sat., ±10 % sat. > 200% sat. | ±2% sat. ≤ 200% sat., ±10% sat. > 200% sat. | --- |
| Barometric pressure correction | 400 to 850 mmHg, automatic or manual | 400 to 850 mmHg, automatic or manual | --- |
| Manual salinity factor correction | 0 to 45 ppt | 0 to 45 ppt | 0 to 45 |
| Calibration features | Water-saturated air, air saturated water, manual (Winkler), and zero point | Water-saturated air, air saturated water, manual (Winkler), and zero point | Water-saturated air, manual (Winkler) |
| Range (temperature) | 0 to 50ºC, 32 to 122ºF | 0 to 50ºC, 32 to 122ºF | 0 to 50ºC, 32 to 122ºF |
| Resolution (temperature) | 0.1ºC, 0.1ºF | 0.1ºC, 0.1ºF | 0.1ºC, 0.1ºF |
| Relative accuracy (temperature) | ±0.1ºC, 0.1ºF | ±0.1ºC, ±0.1ºF | ±0.1ºC, ±0.1ºF |
| Offset calibration (temperature) | 1 point | 1 point | Yes |
| Memory | 5000 with time and date stamp | 1000 with time and date stamp | 50 |
| Log function | Manual, automatic with AUTO-READ or timed | Manual, automatic with AUTO-READ | Manual, automatic with AUTO-READ |
| DO probe with built-in temperature | 9-pin mini-DIN | 9-pin mini-DIN | 9-pin mini-DIN |
| Output | RS232, USB | RS232, USB | -- |
| AC adapter | Optional—universal, 100–240 VAC | Optional—universal, 100–240 VAC | Optional—universal, 100–240 VAC |
| Battery power | Included—4AAs | Included—4AAs | Included—4AAs |
| Battery life | 800 hrs | 800 hrs | 2,000 hrs |
| 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)
Benchtop Meters
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Experience the same dependable performance you value in the field in your lab. High-quality meters are essential to the critical, routine measurements you perform every day. We offer a wide range of benchtop disolved oxygen meters for your measurement needs, performance specifications, and budgetary constraints.
Electrodes & Probes
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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.
Buffers and Solutions
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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.
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.
