16 in 1 Water Test Kit: Accurately test Nitrite, Nitrite, Total Hardness, Free Chlorine, Total Chlorine, Bromine, MPS, Copper, Iron, Lead, Nickel, Sulfate, Cyanuric Acid, Carbonate, Total Alkality , pH.   Quick Drinking Water Test Kit: Dip in pool water for 1 second; do not shake off excess water, wait 15 seconds; compare with a large color chart on the bottle.   Widely used water test strips: These 16 in 1 test strips for drinking water, including drinking water, swimming pools, spas and hot tubs help keep water clean and safe.   High quality spa test strips: Each test strip is made of high quality fiber paper and color block that does not do not mix which ensures accurate and reliable results.   Effective shelf life: These test strips are packaged in well-sealed bottles to ensure that the test strips are stored for 24 months.Sold by the grid cool store