Measuring range: PH: 0 ~ 14.00PH 0 ~ + 1999mV; ORP Precision: PH: ± (0.1%+2) after calibration; ORP: ± 5 mV Resolution: PH: 0.01PH; ORP: 1mV Set the control range: 3.50 ~ 10.50PH, 0 ~ 1000 mV The control power supply specifications: 5A/240VAC The use of the environment: temperature: 0 ~ 50 ℃, humidity