INFINITY introduce pH series intelligent water quality analysis online pH+ controller with high quality pH sensor along with their T type housing for accurate reading online. pH series intelligent water quality analysis online pH+ controller having double relay output facility that helps to make automatic pH correction dosing system, acid/caustic dosing system, mineral adding system etc. pH is the measure of the hydrogen ion concentration in a liquid. pH measure the acidity or alkalinity of a liquid. The pH scale is logarithmic and runs from 0 -14 with 7 being as a natural. Less than 7.0 pH indicate acidic solution. Higher than 7.0 pH indicate alkaline (basic) solution