Feature: 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 30.0mg/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 Electrode6 x Oxygen Membrane Group1 x User Manual1 x Dissolved Oxygen Filling Liquid