1. Muab qhov ntsuas cwj mem electrode rau hauv cov txheej txheem sib xyaw phosphate tsis muaj pH tus nqi ntawm 6.86 (ntawm 25 degree), thiab co nws maj mam;
2. Siv ib tug me me ntswj ntsia hlau los kho lub calibration potentiometer kom txog rau thaum tus nqi tso tawm kom phim tus nqi pH ntawm tus txheej txheem buffer tov ntawm ambient kub;
3. Cov electrode yog muab tso rau hauv PH4.01 potassium hydrogen phosphate los yog borax standard buffer tov ntawm PH9.18;
4. Tus nqi tso tawm yuav tsum nyob rau hauv qhov kev tso cai yuam kev piv nrog tus nqi pH ntawm cov tshuaj tsis haum.
