1. Features - Oxygen and temperature measurement: This dissolved oxygen meter can be used to measure dissolved oxygen and temperature. The built - in microcomputer processor will calculate and compensate all measurement data related to dissolved oxygen and temperature. - Detachable probe: This dissolved oxygen sensor uses a detachable probe, which is easy to replace, and is equipped with 6 probe protection sleeves. - Digital screen display: This dissolved oxygen tester uses a digital screen display, making data reading clearer and more convenient. If it is not used for 8 minutes, it supports automatic shutdown. - Temperature compensation: The solubility of oxygen is affected by temperature, atmospheric pressure, and salinity. An instrument with temperature compensation function can meet daily use requirements. - Wide application: This dissolved oxygen meter is used in various fields such as aquariums, swimming pools, ponds, freshwater aquaculture, marine aquaculture, school teaching experiments, laboratory sterile environments, aquaculture, and scientific research. 2. Package contents - 1 dissolved oxygen meter (without battery) - 1 dissolved oxygen electrode - 6 sets of oxygen membranes - 1 user manual - 1 bottle of dissolved oxygen filling solution