This kit is designed for an analyst to perform a simple colorimetric test to determine the nitrite and nitrate concentrations of freshwater samples. The reaction yields an easily identifiable color transition that can be compared with the colors on the color chart determining the concentrations. Identified nitrite and nitrate values are 0.0, 0.25, 0.5, 1.0, 2.0, 4.0, 6.0, 8.0 & 10.0 PPM. This kit contains everything an analyst would need to perform a water test either in the laboratory setting or out in the field. Kit contains enough materials to perform 40 tests.