pH Buffer Capsule Kit (PH-BUFCAP) is replacing pH Buffer Capsules (PHB, discontinued). Both kits contain the same type of pH buffer capsules and buffer preservative (mold inhibitor). However, there are a total of 30 capsules in PH-BUFCAP (10 each of pH 4, 7, and 10) and only 12 capsules in PHB (4 each of pH 4, 7, and 10), making the price per capsule lower in the PH-BUFCAP.