Type: Water Test Strips, Drinking Water Test Strips, Pool Water Testing, Water Testing for Spa, Drinking Water Chemical Testing, PH Tester Paper Notes: After the test strip is taken out, the bottle cap should be closed immediately, and the desiccant in the bottle should not be taken out. Once opened, use up in 90 days. Keep wet fingers away from the test strips. Test strips are for one-time use and exposure to humidity will make them unusable. Read under natural daylight for best results. Store in a cool dry place. And the expiration date is 1 year from the manufacture date.Description: 16-in-1 water test kit, test all necessary parameters for your swimming pool at 1 time, such as Total Alkalinity, PH, Cyanuric Acid, Carbonate, Total Hardness, Total Chlorine, Free Chlorine, Bromine, Nitrate, Nitrite, Iron, Chromium, Lead, Copper, Mercury, Fluorine. Monitor the water quality at any time you want. Features: One bottle contains 100 test strips, enough balanced for your swimming pool, hot tub, spa and other water testing. Easy to use, just soak in water for 2 seconds; Then take it out, shake excess water off and place the test strip horizontally for 30-60 seconds; Compare with the color chart on the bottle to obtain clear and accurate water quality results. Suitable for testing in tap water, well water, pool water, drinking water, filtered, or any other water source. At least testing twice a week is recommended to keep your pool sparkling clean and safe. Specifications: Material: Paper Color: Multicolor Size: Test strip(LxW): 13 x 0.5cm Bottle(Dia.xH): 5 x 13.8cm Expiration date from the manufacture date: 1 year Package Contents: 1 x One Bottle of Water Test Strips (One bottle includes 100 strips.)