Easy to carry, guaranteed: size 14 x 4 cm, weight 7 ounces, easy to carry. Environmental protection: Water quality should be tested weekly. One package of our test strips contains 100 drinking water test strips. Easy to use: Dip the drinking water test paper in water for 5 seconds, leave it in the air for about 30 seconds, then adjust the color of the back of the bottle to achieve the result. Even for beginners, drinking water test strips are easy to use. Health: Test strips are used for drinking water, faucets, well water, water tanks soft and other water quality tests. Use professional health test strips to test water quality standards. 14 in 1 upgrade: Test total alkalinity, pH, hardness, lead, copper, iron, mercury, chromium / chromium (VI), bromine, nitrates, nitrites, residual chlorine, fluoride and sulphites.