Dissolved Oxygen Meter Detachable Probe Digital Screen Display Dissolved Oxygen Sensor For Aquarium Experiment Research Without Backlit Item Type: Dissolved Oxygen Meter Material: ABS Usage: Suitable for Freshwater Aquaculture, Seawater Aquaculture, Swimming Pool, Beverage Factory, Sewage Treatment Plant, Laboratory. Battery: LR44 x 3 (Battery Not Included) Measuring Range: Oxygen Concentration (mg/L): 0.0 to 30.0mg/L Dissolved Oxygen Saturation (%): 0.0 to 300.0% Temperature: 0.0-40.0& 8451;, 32.0-104.0& 8457; Resolution: Oxygen Concentration (mg/l): 0.1mg/L Dissolved Oxygen Saturation (%): 0.10% Temperature: 0.1& 8451;, 0.1& 8457; Accuracy: Oxygen Concentration (mg/L): ±1.5%F.S Dissolved Oxygen Saturation (%): ±1.5%F.S Temperature: ±0.5& 8451; Calibration Mode: Support One Point or Double Point Automatic Calibration, 0.0% (Oxygen-Free Water) or 100.0% (Air) Response Time: ≤45s (Response at 20& 8451;) Temperature Compensation Range: Automatic (0 to 40& 8451;) Altimetric Compensation: None Battery Level: Low Battery Warning Shutdown: Auto Power off in 8 Minutes if Not Using It Use Environment: 0 to 40.0& 8451; RH Maximum 90%