... .0°C2.Resolution: 0.01 PH, 1 mv, 0.1°C3.Level: +/- 0.02 PH, ±1 mv, +/-0.3°C4.Stability: ≤0 ... groups of ON/OFF relay contact, divided into high and low alarm control.9.Signal isolation output: ... load 10A 220VAC11.Working conditions: environmental temperature is 0 ~ 60°C, relative humidity is 90% or ... mm16.Open hole size: 92x92mm17.Weight: 0.9 Kg High accuracy online PH controller/PH probe/water treatment ...