Features: Upgrade 14 in 1: Test Total Alkalinity, pH, Hardness, Lead, Copper, Iron, Mercury, Chromium/Chromium(VI), Bromine, Nitrate, Nitrite, Free Chlorine, Fluoride, Sulfite Health: Test strips are used for water quality testing of drinking water, faucets, well water, fresh water tanks, etc. Use professional healthy drinking water test strips to test water quality standards. Ease of use: Immerse the drinking water test strip in water for 5 seconds, keep it in the air for about 30 seconds, and then adjust the color of the back of the bottle to get the 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 in length and 7oz in weight, easy to carry. How to use: 1. Immerse the test strip in water for 5 seconds. 2. Take out 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 delete disikcanents Do not touch the test area of the test strip. Specifications Packing List: Option 1: 50pcs x Drinking Water Test Strips Option 2: 100pcs x Drinking Water Test Strips