KL-201 Digital pH Controller Technical Specification: Measuring range:0.00~14.00PH Accuracy:+/-(0.1%+2 digits) after calibration Resolution:0.01PH Set Range:3.50～10.50PH EnvironmentTemperature:0~50℃ Humidity<95℅ Power Supply:220V+/-10℅50Hz+/-2℅ Dimensions:150mm?5mm?0mm Weight:580g