Keep your tank’s water chemistry in top shape with the API GH & KH Test Kit—a reliable solution for measuring both general hardness (GH) and carbonate hardness (KH) in freshwater systems:
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Precise measurement of GH and KH ensures stable water conditions and mimics your fish’s natural habitat
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Comes with two reagent bottles, glass test tubes, and easy-to-follow instructions
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Helps prevent pH swings, supports healthy fish and plant growth, and keeps stress low
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Designed for frequent testing—use weekly to maintain optimal water quality
Perfect for hobbyists seeking consistency and control in their aquarium environment.
