API KH Carbonate Hardness Test Kit - Freshwater & Saltwater
Carbonate Hardness is a big factor in the pH of your tank. Certain fish cannot handle hard water, while for others a certain level of dissolved minerals is necessary. Test your water for Carbonate hardness so you can insure your fish have the proper KH for their health and well-being. For fresh and saltwater.
Add reagent drops to water sample and compare to included color chart.