... wastewater, printing and dyeing, electronic semiconductor, chemical, pharmaceutical, etcFeatures:1.High impedance preamplifier, strong ability of anti-interference 2.Transmission distance ... 0~95% relative humidity, no condensing6.Relay: 2 relays; SPDT contactor, 3A 110/220VAC,3@30VDC ohm7.Temperature compensation: Pt1000RTD, Automatic ... *125mm13.N.W: 1 KG Anjun ph indicator controller with High Quality