API 5 in 1 Freshwater and Saltwater Aquarium Test Strips

API 5-in-1 Test Strips offer a quick and easy way to test the 5 most important aquarium water parameters, pH, KH, GH, Nitrate, and Nitrite in one easy step. Easy to test your aquarium water by simply dipping one test strip directly into the aquarium, and compare the colors on the strip to the color card provided.