A pH meter is an instrument used to determine the pH of a solution. The pH meter works on the principle of a galvanic cell, in which the electromotive force between two electrodes depends on the specific law of energy, both on the properties of the electrode itself and on the concentration of hydrogen ions in the solution. There is a correspondence between the electromotive force of galvanic cell and the concentration of hydrogen ion, and the negative logarithm of the concentration of hydrogen ion is pH value. PH meter is a common analytical instrument, widely used in agriculture, environmental protection and industrial fields.

Application industry：CED,KTL,CATAFORESIS,KATAFOREZ,etc.