Tetra Marine Test 5 in 1 Dip Test - A practical solution for testing marine water.Fast and easy testing of 5 marine water quality parameters: --Tests 5 water parameters in 60 seconds--Tests for Calcium pH KH Nitrite and Nitrate-Ideal for checking the health of marine aquariums-Great Value! Each pack contains 25 strips Water quality is especially important in marine aquariums as the fish and inverterbrates have evolved in and around coral reefs where conditions are extremely stable and consistent and where pollution is minimal. This makes testing the water in a marine aquarium very important to ensure problems are corrected before they can cause harm.However having to test reguarly for a range of parameters can be costly and time-consuming and isnt always practical. Therefore Tetra has developed the Tetra Marine Test 5in1 which checks the main five water quality parameters in 60 seconds.