Thermal Imager - Best Tech Gifts - 11 Home Improvement Gadgets - Bob Vila
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Milwaukee 2260-21 M12 Thermal Imager
For a prettier penny, this thermal imager lets you see through stuff—well, technically it lets you capture the temperature readings of a surface to give you a sense of what lies beneath. Just beam it at a wall, for example, and you’ll be able to see if there are any spots where your insulation is failing. It's not cheap, but really, X-ray vision? Priceless. Available at Ace Tool; $4,150.