Das JBL KH Test Set The JBL CH Test Set is an easy to use quick-test for determining the carbonate hardness or the antacid capacity of saltwater and freshwater. (Recommended level in freshwater: 4 - 8° dKH (GCH)). It corresponds thereby to 1 drop = 1 °dKH.https://www.aquaristikshop.com/aquaristic/JBL-Test-Set-KH-carbonate-hardness/128027/
- Gabriel C. wrote about JBL Test Set KH -carbonate hardness- in 2016:
Great and very neccesary product for a high-tech aquarium.
Thanks for all.