Salifert NIPT Nitrite Test Kit Because of its unique formulation, the Salifert Test Kit does not suffer from amine interference, and offers full color development within one minute The test kit has two different scales: an ultra-low scale for nitrite-nitrogen which ranges from 0.002 - 0.12 mg/L, and a medium scale for nitrite-nitrogen which ranges from 0.02 - 1.2 mg/L Sufficient for up 50 tests Can be used for marine water, freshwater and garden pond water Made in Holland