This is a professional drinking water test strip, which can be used to quickly and easily test water quality. The 16 parameters of this drinking water test strip include pH, lead (Pb), chlorine, hardness, iron, copper, nitrate, sulfate, potassium, chloride, carbonate, total dissolved solids (TDS), heavy metals (mercury, cadmium, chromium 6), and bacteria (E. coli). This 16-in-1 water quality test strip is designed for testing drinking water, aquarium water, well water, pool water, and more. It is easy to use and provides accurate results in just 15 seconds. With this water test strip, you can easily check the water quality of your drinking water at home. If the results exceed the standard, you can take corresponding measures to ensure the safety of your drinking water.