1、This water quality testing kit is used for testing residual chlorine and PH in swimming pool 2、The ideal range of residual chlorine in the pool water is 1.0~1.5ppm and the ideal range for the pH of the pool water is 7.2~7.6 3、Residual chlorine test: Rinse the colorimetric tube with the water to be tested and fill it into the mark. Add 3 drops of residual chlorine reagent, cover the lid and shake it several times to compare the residual chlorine card reading 4、PH test: Rinse the colorimetric tube with the water to be tested and fill it into the mark. Add 3 drops of pH reagent, cover the lid and shake it upside down several times to compare the pH card readings 5、When testing pH, if the residual chlorine content is higher than 3.0ppm, you may get a wrong pH test result. In this case, reduce the residual chlorine content of the pool water before doing any other tests Features: This water quality testing kit is used for testing residual chlorine and PH in swimming pool. The ideal range of residual chlorine in the pool water is 1.0~1.5ppm and the ideal range for the pH of the pool water is 7.2~7.6. Residual chlorine test: Rinse the colorimetric tube with the water to be tested and fill it into the mark. Add 3 drops of residual chlorine reagent, cover the lid and shake it several times to compare the residual chlorine card reading. PH test: Rinse the colorimetric tube with the water to be tested and fill it into the mark. Add 3 drops of pH reagent, cover the lid and shake it upside down several times to compare the pH card readings. When testing pH, if the residual chlorine content is higher than 3.0ppm, you may get a wrong pH test result. In this case, reduce the residual chlorine content of the pool water before doing any other tests. Specification: Condition: 100% Brand New Material: Liquid Height: Approx. 20cm / 7.9in Package list: 1 * Pool Water Test Kit Note: 1. Store in a place out of reach of children. 2. Harmful if swallowed, may cause burning. 3. Store in a cool and dark place. 4. In each beginning season, use new solution to maintain accuracy. 5. Please take a water sample at a depth of 40cm below the water surface.