pH Buffer Powder Seller in Faridabad. Directions for use: Pour the contents of the sachet into 250 ml of demineralized water (at a temperature of 25 ° C), stir with a plastic spoon and wait for the powder to dissolve completely, then calibrate the meter according to the instructions using a solution with a specific pH value. We have pH Buffer Powder available at good and cheap prices in Faridabad. Near me pH buffer powder Seller. We have buffer powders of 4.01, 6.86 and 9.18 available. Contact number for pH buffer powder seller in Faridabad. ph buffer powder manufacturers in Faridabad. A pH buffer solution is used to help check that your pH meter or electrode is calibrated; to ensure that it is working correctly, to help achieve a pH reading.