API® 5-IN-1 Test Strips are a quick and easy way to monitor the 5 most important aquarium water parameters - pH, KH, GH, nitrate, and nitrite - in one step. Simply dip a test strip directly into the aquarium, and compare the
colors on the strip with the
colors on the color chart provided to help prevent unseen water problems that can be dangerous to fish. Each kit includes detailed information on how to interpret test results and correct water problems.