... 20mA output 2.LCD digital indicator with back light 3.Temperature compensation 4. Anjun ph indicator controller with High QualityApplicationIndustrial waste ... ~20.00mA4.Operation: -10~+60degree;0~95% relative humidity, no condensing5.Storage: -20~+70°C;0~95% relative ... humidity, no condensing6.Relay: 2 relays; SPDT contactor, 3A 110/220VAC,3@30VDC ohm7.Temperature compensation: Pt1000RTD, ...