Features: 14-in-1 Upgrade: Test Total Alkalinity, pH, Hardness, Lead, Copper, Iron, Mercury, Chromium\/Chromium (VI), Bromine , nitrate, nitrite, residual chlorine, fluoride, sulfiteHealth: Test strips are used for drinking water, faucets, well water, fresh water tanks and other health testing. water quality. Use professional health drinking water test strips to test water quality standards. the bottle to get the reading. Even for beginners, drinking water test strips are easy to use. ECO-FRIENDLY: Made of eco-friendly PET material. Easy to carry: about 14 cm long, weight about 7 ounces, easy to carry. How to use: 1. Immerse the test strip in water for 5 seconds.2. Take it out and wait 30 seconds.3. Compare the drinking water test strip to the color chart on the bottle. : Choice 1 : 50 pcs X Drinking Water Test Strips