These economical analog pH controllers operate over a range of 0 to 14 pH and -700 to +700 mV with measurements shown on a wide screen 6” display. Accuracy ± 0.1 pH and ±10 mV. Features simple 2-point calibration with manual temperature compensation. High and low setpoints and alarms have continuously variable 0 to 10 minute time delay. Pump and motor controls are on two separate 350 watt outputs. ORP/Redox measurements may be made with the appropriate probe by simply switching to the mV mode. BNC connector. Some models have integral 30-day, 2” chart recorders for permanent record keeping. Cat. No. 640-950-10 has a dual channel input for simultaneous monitoring and control. Bench controllers are 8 H x 14 W x 11” D. NEMA controllers are 12 H x 14 W x 6” D. 115 volt. Warranty: 1 year.