Water Test Strips are made for water quality testing of both qualitative and semi-qualitative. It can detect totally 31 items in water: ph, Total Alkalinity, Residual Chlorine, Total chlorine, Nitrate, Nitrite, Hg, Lead, Iron, Copper, Fluoride, Cyanuric acid, Bromine, Cr, Hardness, Sulfate, Carbonate root, Hydrogen carbonate root, Quaternary ammonium salt, Potassium Permanganate, Sulfite, VC, Calcium, Hydrogen peroxide, Escherichia Coli, Phosphate, Sulfuretted Hydrogen, Chlorine Dioxide, Peracetic acid, Sulfur Dioxide, Ammonia Nitrogen.