This analog controller has separate pH and ORP inputs to measure over the range of 0 to 14 pH and -900 mV to +900 mV with the measurements shown on a wide screen 6” display. Accuracy is ±0.05 pH and ±10 mV. Features include simple 2-point calibration with manual temperature compensation, high or low setpoint for continuous monitoring of a single limit, and recorder output. Dimensions are 6 H x 6 W x 4” D. 115 volt. Warranty: 1 year.