Features: 14-in-1 test strips for total alkalinity, pH, hardness, lead, copper, iron, mercury, chromium, bromine, nitrate, nitrite, residual chlorine, fluoride, and sulfite. Health: Suitable for testing drinking water, faucets, well water, and freshwater tanks to ensure water quality standards. Easy to use: Dip the strip in water for 5 seconds, hold in air for 30 seconds, then match colors with the chart on the bottle. Beginner-friendly. Eco-friendly: Made of PET material. Portable: Compact size (14cm) and lightweight (7 oz). Instructions: 1. Dip strip for 5 seconds. 2. Wait 30 seconds. 3. Compare colors with the chart. Tips: Store away from light and moisture. Close the lid immediately after use. Avoid touching the test area.