1, Everything white in your home “glows” when you shine a UV light on them. Lots of fun.
2, Check if your laptop / mouse / keyboard / screen…needs a good disinfectant wipe. You’ll be surprised how nasty they actually are (if you don’t wipe them every other day w/ alcohol wipes).
3, Install stuff, like tritium tubes, with UV glue.
The sun also emits visible light so your pupils in your eyes contract to reduce the light getting in. Pure UV doesn’t have same effect so your pupils pen up to let more light in…ooops.
We use our UV S2+ with a ZWB2 lens to find puppy urine in carpeting. My youngest son (19) is into rocks these days and has take over the flashlight to illuminate a variety of them.
Used mine to find a transmission fluid leak on our old Honda CRV. Lit the tranny fluid right up. I also use mine to check all the hotel rooms I stay in. PSA: Never use any throw pillows or comforters for anything in a hotel room.