JBL KH Test Kit

The JBL KH Test set is an easy to use quick-test for determining the carbonate hardness or the antacid capacity of saltwater and fresh water.
Recommended level in freshwater: 4-8 Degree GCH(German carbonate hardness). 1 drop = 1 Degree GCH. Colour change from blue to yellow. The number of used drops = level of carbonate hardness.
For this reason test does not require a colour scale.
The most important test in aquatics since KH stabilizes the pH value.