Under what conditions should the glass pH electrode be maintained properly. If there is oil stains on the electrode bulb of the PH glass electrode, it can be lightly wiped with cotton soaked in CCl4 or acetone. Then immerse in a 0.1mol/L HCl solution for 12 hours, and rinse repeatedly with distilled water; How to maintain? The commonly used industrial pH meter electrode can be placed in a pH 4.00 buffer solution or soaked in distilled water for a short period of time. Long term storage, use PH7.00 buffer solution or put on a rubber cap and put it in a box. Generally, the bulbs of PH industrial electrodes should not be left dry for a long time or exposed to direct sunlight.