describe: 14-in-1 Upgrade: Tests total alkalinity, pH, hardness, lead, copper, iron, mercury, chromium/chromium, bromine, nitrates, nitrites, free chlorine, fluoride, sulfites Health: Drinking water test strips, faucet water tests, well water, fresh water tanks, etc. Use professional healthy drinking water test strips to test water quality standards. Easy to use: Dip the drinking water test strip into the water for 5 seconds, keep 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. Environmentally Friendly: Made of environmentally friendly PET material Easy to carry: About 14cm long and weighing about 7 ounces, easy to carry. Instructions for use: 1. Soak the test paper 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. Tip: Keep away from light and moisture. After removing the strap, quickly close the lid. Do not remove the disinfectant. Do not touch the test area of the reagent strip. Product quantity: 50 pieces per bottle Packaging contents: 1 piece of water test paper