An advanced level kit that provides multiple tests for the same 12 parameters as the Basic Test Kit, plus one test each for an additional 8 parameters that can be harmful in drinking water. Test a total of 20 different parameters, this kit offers the most of any DIY water test kit on the market today. 308 TOTAL TESTS: · Total Chlorine x 25 tests · Copper x 25 tests · Free Chlorine x 25 tests · Calcium x 25 tests · Total Hardness x 25 tests · Sulfate x 1 test · Total Alkalinity x 25 tests · Mercury x 1 test · pH x 25 tests · Hex Chrome x 1 test · Nitrate x 25 tests · Zinc x1 test · Nitrite x 25 tests · Silver x1 test · Fluoride x 25 tests · TDS x1 test · Carbonate x 25 tests · Lead (Low Range) x1 test · Iron x 25 tests · Coliform Bacteria (Low Range) x1 test