Features： 1、Oxygen and Temperature: This dissolved oxygen meter can be used to measure dissolved oxygen and temperature. Inbuilt microcomputer processor calculates and compensates all dissolved oxygen and temperature related measurement data. 2、Detachable Probe: This dissolved oxygen sensor adopts detachable probe, easy to replace, equipped with 6 probe protective covers. 3、Digital Screen Display: This dissolved oxygen tester adopts digital screen display, which is clearer and more convenient to read the data. Support auto power off in 8 minutes if not using it. 4、Temperature Compensation: Oxygen solubility will be affected by temperature, atmospheric pressure, and salinity. Our instrument with temperature compensation can meet normal use. 5、Wide Application: This dissolved oxygen meter is widely used in aquariums, swimming pools, pond, freshwater aquaculture, Marine aquaculture, school teaching experiment, laboratory sterile environment, aquaculture, scientific research and other fields Specification： 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 40.0mg/L Dissolved Oxygen Saturation (%): 0.0 to 300.0% Temperature: 0.0-40.0℃, 32.0-104.0℉ Resolution: Oxygen Concentration (mg/l): 0.1mg/L Dissolved Oxygen Saturation (%): 0.10% Temperature: 0.1℃, 0.1℉ Accuracy: Oxygen Concentration (mg/L): ±1.5%F.S Dissolved Oxygen Saturation (%): ±1.5%F.S Temperature: ±0.5℃ 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℃) Temperature Compensation Range: Automatic (0 to 40℃) 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℃ RH Maximum 90% Package List： 1 x Dissolved Oxygen Meter (Battery Not Included) 1 x Dissolved Oxygen Electrode 6 x Oxygen Membrane Group 1 x User Manual 1 x Dissolved Oxygen Filling Liquid