The HI96733C Ammonia High Range Photometer combines accuracy and ease of use in an ergonomic, portable design. A user can accurately determine the concentration of ammonia nitrogen and display as ammonium (NH4+) in freshwater samples within a 0.0 to 50.0 mg/L (ppm) range using the HI93733-0 ready made reagents. The HI96733 offers many advanced features including the exclusive CAL Check™ function used for performance verification and calibration of the meter.