API GH & KH General & Carbonate Hardness Test Kit

When keeping freshwater fish and plants, the general hardness (GH) and carbonate hardness (KH) of aquarium water should match their natural habitat.
The API® GH & KH TEST KIT helps you duplicate the natural habitat of your fish to prevent stress, keeping them healthy!
Contains 2 test bottles, easy-to-ready instructions, and glass test tubes.