Upgraded 14-in-1 Test: Complete test for alkalinity, pH, hardness, lead, copper, iron, mercury, chromium/chromium (VI), bromine, nitrate, nitrite, residual chlorine, fluorine, sulfite. For Better Health: Test strips are used for drinking water, faucets, well water, fresh water tanks and other water sources. Use professional drinking water test strips to determine water quality. Easy to Use: Dip the test strip under water for 5 seconds, hold it in the air for about 30 seconds, then match the colors of the strip on the back of the bottle to get your measurements. Drinking water test strips are easy to use even for beginners Economical: Water quality should be tested weekly. One pack of our test strips contains 100 drinking water test strips