API® 5-in-1 Test Strips are the quick and easy way to test the five most important aquarium water parameters - acidity (pH), general hardness (GH), carbonate hardness (KH), nitrates, and nitrites - in one simple step.

Simply dip one test strip directly into the aquarium, and compare the colors on the strip with the included color chart to help prevent invisible water disorders that may be harmful to fish.

Each kit includes detailed information on how to interpret test results and correct unsafe water conditions.

Size: 4 pieces per box