[EPA LEVEL DETECTION] water test strip is designed and manufactured with reference to EPA standards. Each of our tests can detect pollutants at EPA level. [16-in-1 water quality test kit] The water quality test strip is equipped with 16 main functions, including PH value, hardness, lead, iron, copper, mercury, total alkalinity, nitrite, nitrate, bromine, free chlorine, total chlorine, fluorine, chromium/chromium, carbonate, cyanuric acid, covering the main factors affecting the quality of swimming pools, hot baths or drinking water. [Accurate and scientific water quality test strip] has been committed to of testing and measurement for many years, and has adopted the most reliable test strip on our products to the accuracy of water quality testing. The water quality measurement kit has been used in scientific education. [Save your money] - The pool test strip contains 100 test strips for 100 tests. If you test twice a week, the test last for 6 months. Because of its convenient