Includes an extended range, digital calib., on-screen temperature, large tri-color display and 4-20mA output. Monitors and controls TDS/EC levels for high output commercial systems. 4-20mA output signal can connect to a PLC to record values. Optional steady-beep alarm will sound if TDS/EC level rises above user-set level. Unit will open or close a circuit via dry contacts when the TDS/EC level reaches the set point. Can be used to control pump, solenoid or other device. Includes automatic temperature compensation, on-screen temp. display (C/F), and probe. Protective cover is available. RANGE: EC 0-9999 µS; TDS: 0-5000 ppm; 1-75 C; 33-167 F. Accuracy: ±2. Conversion Factor: NaCl (avg. 0.5). Resolution: 0.1 µS/ppm (0-999); 1 µS/ppm (1000-9999). Digital calibration. Set Points controlled by on-screen buttons. Relay Voltage: 5V; Output Signal: 4-20mA; Output Accuracy (mA): ±1. Probe has 1/2 inch bushing, 3 meter shielded cable. Unit should be supplied 110 or 220 VAC. Measures 2.8 x 2.8 x 4 inches; 1.5 lbs.