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Quick and easy: you will receive your measurement result within a few seconds. Dip the test strip in water for 2 seconds and lay it flat for 15 seconds. Read and compare color charts. 7 in 1: By combining 7 tests (free chlorine, bromine, pH value, total alkalinity, nitrite, hardness, total chlorine) in one test paper, the test is very simple and efficient. Wide applications: contains 50 test strips. Perfect for your pool, spa and other water quality tests. Well packaged: pool test strips are packed in well-sealed bottles for longer durability. Suggestion: It is recommended to test the water quality of your pool once a week. › See more product details; Product description Pool PH Test Strips, 7 in 1 Pool Test Strips for Pool/Spa of PH Value/Free Chlorine/Total Alkalinity/Brom/Nitrite/Hardness/Total Chlorine, Easy to Read (Pack of 50); Product description Pool PH Test Strips, 7 in 1 Pool Test Strips for Pool/Spa of PH Value/Free Chlorine/Total Alkalinity/Brom/Nitrite/Hardness/Total Chlorine, Easy to Read (Pack of 50); Pool PH Test Strips, 7 in 1 Pool Test Strips for Pool/Spa of PH Value/Free Chlorine/Total Alkalinity/Brom/Nitrite/Hardness/Total Chlorine, Easy to Read (Pack of 50)