What are the uses of ultraviolet flashlights?

Ultraviolet (UV) flashlights are used for a variety of applications, including detecting counterfeit currency and identifying certain materials, such as pet stains or bodily fluids, that fluoresce under UV light. They are also employed in forensic investigations to reveal evidence not visible under regular lighting. Additionally, UV flashlights can be used in scientific research, mineral identification, and even in certain medical applications, like sterilizing surfaces or equipment.