@ai6yr I really wished I had one of those when I started to suspect one of our kitchen walls (in the last house) had no insulation. I confirmed it with a lot of laser-thermometer work on hot and cold days, but it would’ve been much easier to convince my husband with a camera 😂 Do your house! Do the house you’re staying in! I bet you’ll find some weird secret insulation-gaps.
(Do you know any equestrians? We love those things too for evaluating saddle fit by looking at the blood flow in the horse’s back!)