16 in 1 Water Test: The test strips can be used for testing total alkalinity, pH, hardness, residual chlorine, total chlorine, nitrite and other projects, and it features the water quick test, which provides results in a matter of seconds.Practical in Use: Swimming pool test strips are suitable for drinking water, aquarium, fish tank, swimming pool and spa, industrial water, pond, hot spring water testing. Practical in Use: Swimming pool test strips are suitable for drinking water, aquarium, fish tank, swimming pool and spa, industrial water, pond, hot spring water testing. Fine Quality: The high-quality water test strips with precise colour coordination and high sensitivity, and the drinking water test strips can be used for testing water quality. Easy to Use: Dip the drinking water test paper into the water for 2 seconds, hold it in the air for about 1min, then adjust the color of the bottle back to get the reading. Portable Design: The box contains 100 pieces of test strips, and the water quality should be tested weekly, and the drinking water test strips are to use for beginners.