For use with eXact Photometers, the eXact Strip Micro Ammonia for eXact 638nm Photometers incorporates the patented eXact reagent delivery system created by Industrial Test Systems, Inc. which is ideal for technical and non-technical users. By dipping the eXact strip into a photometer cell, the exact amount of reagent is released into the water causing a change in color or turbidity. The change is measured by an eXact photometer giving the user fast and accurate results. Each unit consists of a kit containing (1) bottle of 50 NH3 strips and and dropper bottle with liquid reagent for 50 tests.