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Unique 2-tablet reagent system measures nitrate nitrogen from 0 to 15 ppm (0 to 66 ppm as nitrate) in one-third the time required for other nitrate test kits. Kit includes foil-wrapped, unit-dose tablets for 50 tests, easy-to-handle plastic test tubes with spill-proof caps, and plastic Octa-Slide color comparator with values at 0, 1, 2, 4, 6, 8, 10, and 15 ppm nitrate-nitrogen./! WARNING: LaMotte� products are not toys. Adult supervision is strongly recommended. Products may contain ingredients that require additional safety precautions; refer to all safety guidelines and Material Safety Data Sheets contained on the MSDS CD or at www.lamotte.com.