Thermo Scientific Orion® RDO Optical Dissolved Oxygen Probe with 10m Cable 0.00 to 20.0 mg/L. Thermo Scientific Orion® RDO (Rugged Dissolved Oxygen) luminescent probe is not affected by color or turbidity, making them great for measurements from effluent, aeration basins and even influent. Utilizes the latest lumiphore technology for measuring DO. Requires little maintenance, making measurements simpler and easier. The speed, accuracy and precision of the RDO probe is equivalent or superior to current DO measurement techniques. Innovative optical dissolved oxygen design. Accurate, dependable dissolved oxygen readings. Calibrate using water saturated air, air saturated water, zero point or at a custom point with winkler titration. Includes optical cap, stainless steel sensor guard and calibration sleeve. IP68 rated, waterproof. DO concentration range: 0.00 to 20.0 mg/L. DO resolution: 0.01, 0.1 mg/L. DO relative accuracy: +/-0.1 mg/L up to 8 mg/L, +/-0.2 mg/L from 8 to 20 mg/L. DO saturation range: 0.0 to 200%. DO resolution: 0.1, 1%. DO relative accuracy: 2%. Barometric pressure correction: 450 to 850mm Hg, automatic or manual. Calibration features: Water saturated air, air saturated water, manual and zero point. Sensor type: RDO optical. Temperature range: 0 to 50 C. Temperature resolution: 0.1 C. Temperature relative accuracy: +/-0.3°C. Per each. Thermo Scientific Orion® #: 087030MD.