NTlabs Carbonate Hardness KH Test Kit

The NT Labs KH Test Kit lets you quickly and accurately measure carbonate hardness — a key indicator of buffering capacity and pH stability — in marine or freshwater aquariums. The drop-and-titration reagent method delivers precise readings in dKH, so you know exactly how stable your water’s chemistry is. Ideal for reef tanks and sensitive setups, it helps you maintain the correct KH level (typically around 7 dKH for seawater, or 7–14 dKH depending on your system) to avoid pH swings that can stress fish and corals. Regular testing ensures you can adjust with buffer or water changes before problems arise, helping keep your aquatic environment healthy and balanced.