Ordering Information HI3873 test kit comes with 100 packets nitrite reagent, glass cuvette, and color comparison cube. Specifications Range 0.0 to 1.0 mg/L (ppm) NO-N Resolution 0.2 mg/L (ppm) Method chromotropic acid Number of Tests 100 CTK Type Colorimetric The HI3873 is a colorimetric chemical test kit that determines the nitrite concentration in samples within a 0.0 to 1.0 mg/L (ppm) range as nitrite-nitrogen (NO2--N). The HI3873 is supplied with all of the necessary reagents and equipment to perform the analysis. The test kit contains enough reagents for perform approximately 100 tests