PhotonWrangler
Flashaholic
I have a set of glow rods (cable fishing rods) and I discovered that one of them was missing from the set. So I retraced my steps from the last couple of times that I've used it, using a 365nm UV flashlight in the hopes that the green glow of the rod would jump out at me from the clutter of cables, pipes and other stuff in the ceiling. I haven't found the missing rod but I discovered some unexpected fluorescence in some cable jackets. I also found that some semi-illegible and faded handwritten labels were much more readable under the UV light, since the background paper glowed brightly while the ink residue didn't.