... with back light 3.Temperature compensation 4. Anjun ph indicator controller with High QualityApplicationIndustrial waste water,pure water, circulating water,food ... % relative humidity, no condensing6.Relay: 2 relays; SPDT contactor, 3A 110/220VAC,3@30VDC ohm7.Temperature compensation: Pt1000RTD, Automatic compensation range ... : 96*96*125mm13.N.W: 1 KG Anjun ph indicator controller with High Quality