Measurement accuracy:PH 0.02pH ORP:±1mV;Input impedance:≥ 10 Ω;Range:-10 to 130°C Manual/Automatic;Operating Temperature:0 to 60℃;Power supply:AC: 220V±10%, 50Hz/60Hz ; DC: 24VDC;RS485 output:Isolated, Modbus-RTU communication protocol;Current Out