Features: 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 other water quality tests. Use professional drinking water test strips to check water quality standards. Easy to use: Dip the drinking water test strip into the water for 5 seconds, leave it in the air for about 30 seconds, then compare the color to the chart on the bottle to get the reading. These drinking water test strips are easy to use, even for beginners. Eco-friendly: Made of eco-friendly PET material Easy to carry: Approximately 14 cm in length, weighing about 7 ounces, convenient for portability Way to use: 1. Immerse test strip in water for 5 seconds. 2. Remove and wait for 30 seconds. 3. Compare the test strip to the color chart on the bottle. Tips: Keep away from light and moisture. After removing the strip, quickly replace the cap. Do not remove disinfectants. Avoid touching the test area of the reagent strip. Specification: Package list: Choice 1: 50 pcs x drinking water test strips Choice 2: 100 pcs x drinking water test strips