Wifey is working on an art project w/ the kids & got a cpl small black light, flash lights
looking around the house at stuff because it detects other things besides art projects
I must have sprayed lubricant? WD40? on the hinges. this is normally invisible
then we started looking around at everything, including kitchen splatters. pretty hilarious, Wifey was horrified. thankfully the bathroom was clean. the cat was spooked
apparently also good for finding scorpions & rodent trails. think I get a cpl more for myself, for use in our basement, attic crawl spaces & our Mother's vacant house