The conductivity-salinity-temperature measuring instrument can measure conductivity, salinity and temperature correctly, and the built-in microprocessor can calculate and compensate measured parameters. This instrument has IP 65 protection grade, which is dustproof and splash-proof. Its power supply is DC24V, colored LCD may display salinity, conductivity and temperature synchronously in real time, and it adopts three-wire system 4-20mA signal to output salinity signal. The sensor uses inductive probe without electrode, so no polarization reaction exists. It can measure media and solutions with serious pollution and easy to settle. The measurement is completely isolated electrically with media.