I bought one of these at HD to help detect air leaks and drafts. I live in a log home have replacement windows which is a big help. But main floor was still drafty. I played around with it some I could not believe just HOW many small drafts I found. Did the same thing in my basement, where the NC-30 is same thing. When you add up all the small air leaks it adds up to alot of cold air getting in my house. I paid 39bucks for it. I would recommend if you dont have one to get one of these IR thermometers. Its a neat toy but I can see its going to be a great tool also. Much better than using a bic lighter or the back of your hand to find the drafts.
Tony
Tony