A UV Light Flashlight, also known as a blacklight flashlight, emits ultraviolet (UV) light in the range of 365-400 nanometers (nm). These flashlights are commonly used to detect counterfeit currency, forensic evidence, pet stains, and fluorescent minerals. It's important to note that prolonged exposure to UV light can be harmful to human eyes and skin, so it's important to use caution when using a UV light flashlight. It's recommended to wear protective eyewear and avoid shining the light directly on your skin for extended periods of time.