A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH.[2] The pH meter measures the difference in electrical potential between a pH electrode and a reference electrode, and so the pH meter is sometimes referred to as a "potentiometric pH meter". The difference in electrical potential relates to the acidity or pH of the solution.[3] The pH meter is used in many applications ranging from laboratory experimentation to quality control.[ ph meter جهاز ph meter calibration ph meter egypt ph meter price ph meter adwa ph meter مكونات ph meter types ph ميتر 01151595541 b&q ph meter ph eh meter ph meter سعر جهاز ph meter سعر جهاز ph meter pdf with ph meter ph meter b&q ph meter diagram ph meter working ph meter digital ph meter for soil ph meter 0-14 ph meter 0.01 accuracy ph meter 009 ph meter 02 ph meter 0-10v ph meter 0.001 ph meter 0.01 ph meter 0-14 ph ph meter range 0 1