Tests tap water & freshwater aquariums for general hardness (GH) and carbonate hardness (KH).Helps prevent fish stress caused by rapid pH shifts, the result of low levels of KH.
![API Carbonate Hardness Test Kit API Carbonate Hardness Test Kit](https://cdn11.bigcommerce.com/s-ldfio/images/stencil/500x659/products/3107/184390/original__71007.1721061249.png?c=2)
Tests tap water & freshwater aquariums for general hardness (GH) and carbonate hardness (KH).Helps prevent fish stress caused by rapid pH shifts, the result of low levels of KH.