Upgraded 14-in-1 Test: Complete testing for alkalinity, pH, hardness, lead, copper, iron, mercury, chromium/chromium (VI), bromine, nitrate, nitrite, residual chlorine, fluoride, sulfite. For Better Health: The test strips are used for drinking water, tap water, well water, freshwater tanks, and other water sources. Use the professional drinking water test strips to detect water quality. Simple to Use: Immerse the test strip underwater for 5 seconds, keep it exposed to the air for about 30 seconds, and then match the strip colors on the back of the bottle to get your readings. The drinking water test strips are easy to use, even for beginners. Economical: Water quality should be tested weekly. One pack of our test strips includes 100 drinking water test strips