... , PH sensor using the electrochemical law to measure the pH value 2, High precision school ... in chemical, biological, environmentaland many other fields to measure the pH of the solution.4,Usage: PH ... sensor circuit , used to measure PH data of solution. Connect the electrode with the sensor, remove the sealing ... the sphere glass-film, and absorb the droplet with absorbent paper, pls don’t rub the glass ...