The HI96715 Ammonia Medium Range Photometer combines accuracy and ease of use in an ergonomic, portable design. Using the HI93715-0 ready made reagents a user can accurately determine the concentration of ammonia nitrogen (NH3-N) in freshwater samples within a 0.00 to 9.99 mg/L (ppm) range. The HI96715 offers many advanced features including the exclusive CAL Check™ function used for performance verification and calibration of the meter.