This easy-to-use liquid test kit helps you adjust your water parameters for the success of your reef aquarium. Measures four essential water parameters. Long-lasting kit contains tests for calcium (70 tests), carbonate hardness (number of tests varies by water hardness), phosphate (150 tests), and nitrate (110 tests). Included instructions explain how to use the tests in an easy-to-understand manner for precise test results. Kit contents: 7 test bottles, instruction booklet, 4 glass test tubes, and 2 color cards.