Smart conductivity sensor, using RS485 communication interface and standard Modbus protocol. Provides measurements applicable to low, medium, and high range electrical conductivity, the electrode constant is from 0.1 to 10 cm-1, electrode materials are graphite, platinum, stainless steel，it can Measure conductivity, TDS, salinity. Corrosion resistant shell，built – in PT1000 temperature sensor and compensation algorithm，applicable to all kinds of harsh working environment. Included with data analysis software，with calibration, recording, analysis, diagnosis and other functions. The electrode has the advantages of good accuracy, good linearity and stable electrode constant.