The HI93715-03 are reagents for the colorimetric determination of ammonia nitrogen (NH3-N). There are enough reagents for 300 tests and are for use with Hanna's compatible benchtop and portable photometers. These high quality reagents are manufactured in our state-of-the-art facility and are clearly marked with the lot number and expiration date on each bottle for traceability. The HI93715-03 are high quality reagents that are pre-measured, allowing for users to achieve fast and accurate colorimetric measurements. These reagents follow the Nessler Method in which the reaction between ammonia and the reagent causes a color change in the sample. The intensity of color is determined by a compatible photometer and the concentration and based upon the meter will be displayed in mg/L (ppm) as ammonia (NH3) or ammonia nitrogen (NH3-N). These reagents are designed to be used with samples that have an expected range of 0.00 to 9.99 mg/L ammonia.