[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 50 test strips for 50 tests. If you test twice a week, the test will last for 6 months. Because of its convenient operation, it also saves time. [Widely used water test kit] 16-in-1 water test strip can be applied to a wide range of water detection, such as drinking water, swimming pool, hot tub, spa, pond, aquarium, industrial wastewater, etc. Material: paper Color: as shown Package Contents: 50 x test strips 1 x test tube 1 x dropper Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.