The pH meter measures the difference in electrical potential between a Basically, three parameters are involved in the measurement: the actual molar concentration of hydrogen ions, the dissociation constant of the acid (pKa), and A pH meter is a device that measures the hydrogen ion concentration, termed as pH, in a solution, indicating its acidity or alkalinity. From the book Analytical Methods in Chemical Analysis. You Will Generally Need More Than One Buffer For Calibrating A pH Meter. pH Me