The Pinpoint Nitrate Monitor is an affordable and accurate digital nitrate measurement instrument engineered for marine saltwater. The Pinpoint Nitrate Monitor has been designed as a precision spot-testing instrument. There are 2 independent measurement ranges: Low Range is 110 ppm nitrate and High Range is 10100 ppm nitrate. Resolution is 1 ppm in either scale. Accuracy is 1 ppm after calibration. The Pinpoint Nitrate Monitor is sold complete with meter, probe and all calibration fluids (9 volt battery not included). Can be used with the Pinpoint AC Adapter Kit. User Guide (AmericanMarineUSA.com Web site in new window)