Specifications: Condition: Brand New Material: Liquid wastes Color: As shown in the picture Size: Box: Approx.15cm/5.9in(L) Application: and test. The ideal range of in the pool water is 1.0-1.5 ppm; the ideal range for the of the pool water is 7.2-7.6. Usage: : Rinse the colorimetric tube with water to be tested and fill it into the scale. Add 3 drops of reagent, cover the lid and shake it several times to compare the color card reading. : Rinse the colorimetric tube with the water to be tested and fill it into the mark. Add 3 drops of reagent, cover the lid and shake it upside down several times to compare the card readings. Package List: 1*Swimming Pool Water Test Box Reagent 1*OTO Reagent 1*Test Bottle Set Note: When testing , if the content is higher than 3.0 ppm, you may get a wrong test result. In this case, reduce the content of the pool water before doing any other tests. Warning: Store in a place that is out of reach of children. Harmful if swallowed, may cause burning, store in a cool and dark place. In each beginning season, please use new solution to maintain accuracy. Please be at a depth of 40 cm below the water to take a water sample.