NIUNIU 14 in 1 Upgrade: Test Total Alkalinity, pH, Hardness, Lead, Copper, Iron, Mercury, Chromium/Chromium, Bromine, Nitrate, Nitrite, Free Chlorine, Fluoride, Sulfite Health: Drinking Water Test Strips, Water testing for faucets, well water, fresh water tanks and more. Use professional healthy drinking water test strips to test water quality standards. EASY TO USE: Dip the drinking water test strip in water for 5 seconds, hold it in the air for about 30 seconds, then adjust the color on the back of the bottle to get a reading. Drinking water test strips are easy to use even for beginners. Eco-friendly: Made of eco-friendly PET material Easy to carry: About 14cm long and about 7oz in weight, easy to carry. How to use: 1. Immerse the test strip in water for 5 seconds. 2. Remove and wait 30 seconds. 3. Compare the drinking water test strip to the color chart on the bottle. Tips: Keep away from light and moisture. After removing the strap, quickly close the lid. Do not remove disinfectant Do not touch the test area of the reagent strip. Product Quantity: 50 pcs a bottle Product color: as pictured