100 Pcs Swimming Pool Test Paper Pool Water Ph Value Hardness Mercury Lead Copper Iron Bromine Multi-Parameter Water Quality Test Paper *: Safe for the environment! Our strips are . Quick and easy testing steps: Step 1: water sample with plastic tube (not included). Step 2: Dip the test strip into desired water sample and remove within 1-2 seconds. Step 3: Hold the test strip horizontally and gently tap or to remove excess water Step 4: Under good light, hold the test area close to the chart on the bottle label and carefully read the test results within . They are great for testing drinking water, pools and hot tubs, spas, fresh water, spring water, hydroponics, aquariums, , scientific experiments, and more. Results are fast, most available within minutes, and are very easy to read following our colorimetric chart and instruction manual. Details: * Material: Water Quality Test Strips * Color: As shown in the picture Included: * Style: 50 strips or 100 strips Easy and Convenient to use Bring you a beautiful feeling and a good mood in the day Use safe and compliant materials, you can rest assured to use Pass the quality test, please rest assured to use. If you have any questions, please feel free to contact us. We are happy to help you