Keep your fish healthy and thriving by testing your aquarium water regularly with easy to use API 5 in 1 Test Strips. API 5-in-1 test strips for freshwater and saltwater aquarium help fish owners measure levels of Nitrite, Nitrate, Carbonate and General Hardness, and pH found in aquarium water. In order for fish to thrive, water must be similar to that which could be found in their natural environment. Poor water quality can cause fish stress, illness and even death. API 5 in 1 Test kits, convenient and easy testing of Aquarium water. In order to maintain a healthy and vibrant Aquarium, regular testing of the water is essential. Certain chemicals are present in the water and when their levels rise or fall, it can cause potential damage to the fish and plants. Testing the water can give you a chance to quickly and effectively treat the water to prevent long term damage. The API 5 in 1 Test Kit is an easy to use set. Simply dip a test strip into the water and compare it against the colour chart supplied. API 5-In-1 Test Strips, which are for freshwater or marine aquariums, are a quick and accurate way to test for pH, Nitrite, Nitrate, General Hardness (GH) and Carbonate Hardness (KH). It contains a desiccant-lined tube, with snap-tight cap, which provides maximum moisture protection for accurate results. The kit includes information on how to correct unsafe water conditions.