Using the simple color disc method, this kit measures Iron (medium range: 0.1 - 4 mg/L) and contains reagent for 100 tests. Simple, low-cost color disc method is the most accurate visual test kit method Kit contains all required reagents and apparatus in a rugged carrying case for analysis in the field Quickly and accurately measurei iron in the field or in the lab Includes one reagent, two color discs, comparator box, two viewing tubes, instructions and carrying case.