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6 in 1 Aquarium Test Strips: Aqua Care Pro strips test for General Hardness, Nitrite, Nitrate, pH, Carbonate Hardness, and Chlorine. Accurate and Fast Acquisition of Measurement Results - Please put the aquarium test strips into the water for 30 seconds and remove it, then hold the strip horizontally and compare with color chart on bottle to get accurate value of the fish tank. Keep Your Fish Safe and Healthy: We recommend testing your fish tank at least twice a week. At the same time, we also provide a manual, which explains the various indicators of the water within which standards are beneficial to the growth of the fish.