Online Conductivity Controller LOCC-A10 features 3 points conductivity calibration system, TDS measurement mode, and 4 to 20 mA output signal transmitter. The large and clear back light LCD displays Calibration and setup values, Temperature values, ATC (automatic temperature compensation) values, high and low limit of measurement. This controller measures Conductivity and TDS values in µS/ cm, and mS/ cm units.