As a reef keeper, you already know how important water testing is to your thriving aquarium. But you are ready for more sensitive species that require more precise parameters and more in-depth testing. This is where the Reef Master test kit comes in! This kit is the easiest way to test Calcium, Carbonate Hardness (KH), Phosphate, and Nitrate. These reagents are included with this kit, as well as 4 test vials with caps, instructions and easy to read color charts.