Upgrade 14 in 1 : Test total alkalinity, pH, hardness, lead, copper, iron, mercury, chromium/chromium (VI), bromine, nitrate, nitrite, residual chlorine, fluoride, sulfite Health : Test strips are used for drinking water, faucets, well water, fresh water tanks and more water quality tests. Use professional drinking water test strips for health to test water quality standards. Easy to use: Dip the drinking water test paper into the water for 5 seconds, keeps it in the air for about 30 seconds, and then adjust the color of the back of 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 14cm in length, weight about 7 ounces, easy to carry. Way to use: 1. Immerse test strip in water for 5 seconds. 2. Take it out and wait for 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 replace the cover. Do not remove disikcanents No touching the testing area of the reagent strip. Specification : Package list: Choice 1: 50pcs X drinking water test strips Choice 2: 100pcs X drinking water test strips includes: Choice 1: 50pcs X drinking water test strips Choice 2: 100pcs X drinking water test strips