The principle of a pH meter involves measuring the hydrogen ions (H⁺) concentration in a solution through an electrochemical technique. A pH meter includes a glass electrode along with a reference electrode. These two electrodes together measure the electrical voltage produced due to hydrogen ions in the solution. The voltage measured can be converted to pH values using the Nernst equ... https://www.bionicsscientific.com/blogs/ph-meter-working-principle/