The test kit uses a color chart that measures Copper and Iron levels at 0.1, 0.3, 0.6 and 1.0 ppm. The test kit is simple to use with just adding 3 drops of Copper reagent to a 5 mL test tube of water then matching the color reaction to the color chart. The Iron test is measured by adding 5 drops of Iron reagent along with an Iron TesTabs® tablet to a 5 mL test tube of water then match the reacted sample water with the color chart.