Electronic pH meter calibration buffer set with 4.01, 7.00 and 10.01pH buffer bags. Powder from one bag is mixed with 250ml of deionized or distilled water, after which the solution has 10.01 pH at 25°C. Powder bag contains a pH conversion scale for 10°C - 50°C temperatures for convenient use. Sealed pH powder bags have virtually unlimited storage life.
