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This is a tough call to make. You really need to have a standard, that is a known concentration of nitrate, to determine which test kit is closest to the truth. Every test kit can vary from manufacturing batch to batch. Except for tests like Hanna and Hach, no test kit provides you with any information on accuracy and precision. It is really a crap shoot.NYOS reading 10ppm for Nitrates. API and Salifert reading closer to 30-40ppm based off coloration. Trust the two or go with the NYOS?