ATP is a useful indicator for surface cleaning effectiveness. Alphabetically, the main suppliers are Biocontrol, Charm Sciences, Hygiena, Kikkoman, LuminaUltra, 3M, Neogen, R-Biopharm. Because ATP is in an abundance in hands, recommend it only be used as an educational teaching tool for handwashing hygiene compliance e.g., soiled hand is typically > 100,000 RLU; properly washed hand is < 10,000 RLU. The problem is that even a washed hand that doe not touch other surfaces will eventually trend towards higher ATP levels due to skin cells shedding and perspiration. In the 90s a study showed higher ATP levels on hands from managers on production floor than line workers. Makes sense as managers are touching more soiled surfaces moving between depts/offices, and also often fall short of HW compliance sops compared to line workers, who wash more often or more diligently due to routine practice.