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1) PH got PH test kit/meter to measure which good range is ~ 8.1 to 8.3 (am using a ph pen to measure) ph pen 2) KH i am using salifert to test which good range is (8 ~ 12dKH), alk and kh is the same test kit. salifert kh/alk tester The total carbonate and bicarbonate concentration is also called alkalinity (alk) or carbonate hardness (KH) Click this link for more info1 point