... 4. Drinking water,Swimming pool and Tap water PH controller/PH meter/PH electrode ApplicationIndustrial waste water,pure water, circulating water,food wastewater ... limit alarm, 2 separate 220VAC/3A relay output6.Automatic temperature compensation from 0~100°CTechnical specifications:1. ... 110/220VAC,3@30VDC ohm7.Temperature compensation: Pt1000RTD, Automatic compensation range: 0~100°C8.Accuracy: 0.25% ...