[EPA Level Detection] Water quality test strips are designed and manufactured with reference to EPA standards. Each of our tests can detect EPA-level pollutants. [16 in 1 Water Quality Test Kit] Water quality test strips are equipped with 16 major functions, including pH, hardness, lead, iron, copper, mercury, total alkalinity, nitrite, nitrate, bromine, free chlorine, total chlorine, fluoride, chromium/chromium, carbonate, cyanuric acid, covering the main factors affecting the quality of swimming pools, hot tubs or drinking water. [Accurate and Scientific Water Quality Test Strips] We have been committed to testing and measuring for many years, and have adopted the most reliable test strips on our products to ensure the accuracy of water quality testing. The water quality measurement kit has been used for scientific education. [Save Money] - Pool test strips contain 50 test strips for 50 tests. If you test twice a week, the test will last for 6 months. It also saves time due to the convenient operation. [Widely Used Water Quality Test Kit] 16 in 1 water quality test strips can be applied to a wide range of water quality testing, such as drinking water, swimming pools, hot tubs, spas, ponds, aquariums, industrial wastewater, etc. Material: Paper Color: As shown in the picture Package Contents: 50 x Test Strips 1 x Test Tube 1 x Dropper Only the above package contents, other products are not included. Note: Light reflection and different monitors may cause the color of the item in the picture to be slightly different from the actual item. The measurement allowable error is +/- 1-3cm.