The PINPOINT™ Nitrate Monitor has been designed as a precision spot-testing instrument. There are 2 independent measurement ranges: Low Range is 1–10 ppm nitrate and High Range is 10–100 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). Given proper care, the PINPOINT Nitrate Monitor™ should last a lifetime. Powered by a standard 9-volt battery (not included).