In the fly tying world, cure that uv resin!  This light does it.  It will also help you see the invisible. Engineered with Dual UVA (Ultraviolet A) Technology for better detection, inspection, and authentication in both residential and commercial applications. The broad–spectrum wavelengths provide a blended illumination and fluorescence that is ideal for tasks such as detection of pet urine, inspection of auto leaks with UV dyes, cleaning inspections, pest detection such as scorpions, and authentication of currency. Compact and pocketable, with a wrist lanyard, this light is constructed with a durable aluminum housing that is impact–resistant and water–resistant. Powered with three AAA batteries (included).