ATP fluorescence detection principle of ATP (Adenosine Triphosphate, ATP) is the direct source of all life forms of energy, commonly found in animal and plant cells, microorganisms and residues in food. ATP fluorescence detection is based on the principle of firefly light detection technology developed rapidly. Under aerobic conditions, luciferase catalyzes the oxidation of luciferin and ATP to form oxidized fluorescein and emits fluorescence. The fluorescence intensity is directly proportional to the number of microorganisms. By testing the intensity of the fluorescence signal can be detected by the target microbial contamination level, so the detection of ATP can be used as a clean indicator to determine whether the clean.