ph indicator controller 1.Isolation type 4~20mA output ... 4. Drinking water,Swimming pool and Tap water PH controller/PH meter/PH electrode ApplicationIndustrial waste water,pure water, circulating water, ... 1.Indicator: LCD display with back light2.Measuring range: pH:0.00~14.00pH; ORP:-1999~+1999mV3.Signal output: ... KG Drinking water,Swimming pool and Tap water PH controller/PH meter/PH electrode