... electrochemical law to measure the pH value 2, High precision school equipment in digital lab 1,Range: 0~14 2,Resolution: 0.013, Application ... PH electrode and sensor circuit , used to measure PH data of solution. Connect the electrode with the sensor, remove the sealing cap ... ’t touch the sphere glass-film, and absorb the droplet with absorbent paper, pls don’t rub the glass electrode back ...