Features: 1Oxygen 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. 2Detachable Probe: This dissolved oxygen sensor adopts detachable probe, easy to replace, equipped with 6 probe protective covers. 3Digital 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. 4Temperature Compensation: Oxygen solubility will be affected by temperature, atmospheric pressure, and salinity. Our instrument with temperature compensation can meet normal use. 5Wide 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 Package included: 1 x Dissolved Oxygen Meter&nbsp(Battery Not Included) 1 x Dissolved Oxygen Electrode 6 x Oxygen Membrane Group 1 x User Manual 1 x Dissolved Oxygen Filling Liquid