... back light 3.Temperature compensation 4 ph sensor 4-20ma ApplicationIndustrial waste water,pure water, circulating water,food wastewater treatment, ... alarm, 2 separate 220VAC/3A relay output6.Automatic temperature compensation from 0~100°CTechnical specifications:1.Indicator: ... relays; SPDT contactor, 3A 110/220VAC,3@30VDC ohm7.Temperature compensation: Pt1000RTD, Automatic compensation range: 0~100°C8 ...