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PSC-150 is a TDS/EC controller that monitors and controls levels of Total Dissolved Solids (TDS) or Electrical Conductivity (EC) in water. The new controller includes an extended range, digital calibration, on-screen temperature, and a tri-color display. Once the TDS/EC level drops below the set point, this will deactivate the light and alarm and switch the contacts back to the normal position (normally open or closed).