Hach Products Nitrogen, Nitrate Test Kits Click here to download the PDF Document for the following products. • Nitrogen-Nitrate, 0-50 mg/L, 50 tests, Cube • Nitrogen-Nitrate, Model NI-14**, 50 tests, Color Disc • Nitrogen, Nitrate NI-11** • Nitrogen- Nitrate, AccuVac® Kit, 25 Tests, Color Disc • Nitrate, Pocket Colorimeter II