Water conductivity sensor for measuring the conductivity of solutions. It has an automatic temperature compensation function, which can compensate the current temperature conductivity to the specified temperature. This conductivity sensor adopts an integrated design, and the structure is lighter and simpler. It can measure the values of conductivity, salinity and TDS at the same time. It is widely used in places such as cross-section water quality, aquaculture, sewage treatment, environmental protection, pharmaceuticals, food and tap water.