This kit is built around four separate liquid reagent tests that check high range pH, ammonia, nitrite, and nitrate levels in marine aquarium water. Each kit includes four glass test tubes with snap-tight caps, a holding tray, a test tube rack, and a set of test solutions used to develop color reactions in a water sample. A laminated, color-coded chart paired with a step-by-step instruction booklet is included so results can be compared and interpreted after each test. To run a test, a small water sample is added to a clean tube along with the appropriate reagent drops, then shaken and left to develop color before being checked against the chart. Tubes should be rinsed with clean water immediately after each use to prevent residue buildup, and components are best stored at room temperature. The kit is intended for repeated use over time rather than a single application, since each bottle of solution supports many individual tests.