[16 in 1 Swimming Pool Test Paper] PH test paper can test pH value, free chlorine/bromine, total chlorine, total alkalinity, cyanuric acid and total hardness of your swimming pool and of your spa respectively. Keep the water healthy and clean all year round Swimming pool test paper The test paper adopts high quality imported filter paper. Some hydrotherapy test strips are packaged in easy-to-store containers. Each set contains 200 water quality analysis test papers for drinking water test papers. The different colors on the box and package make it possible to determine the measured value accurately and easily. [The test paper is easy to read] Dip the test paper in water for 2 seconds, then remove it and wait 60 seconds. Compare all color changes to the color chart on the side of the bottle for accurate water quality results. It's an easy way to test 16 parameters at once. [Storage Method] For best results and longer shelf life, please store the product in a dry, cool and dark place . Do not touch the test strip test area; keep away from light and humidity. After removing the strip, quickly close the lid. The bag is well sealed to ensure that the spa test kit can be stored for 2 years. [Multifunctional test strip] The test strip is very suitable for testing swimming pools, drinking water , hot tubs, well water, hot springs, aquariums, etc. It is very convenient to take it everywhere. You can accurately know the content of chemical substances in the water.