Conductivity and TDS Digital Panel Mount Controller, dual setpoint, on/off and PID controls, analog output, range: EC 0.0 to 199.9 µS/cm; 0 to 1999 µS/cm; 0.00 to 19.99 mS/cm; 0.0 to 199.9 mS/cm, TDS 0.0 to 100.0 ppm; 0 to 1000 ppm; 0.00 to 10.00 ppt; 0.