Porter Cable Infrared Thermometer
Think your old windows might be leaking out your money in the form of heat? Worried that there are small creatures living in your walls? The Porter Cable Infrared Thermometer ($50) can help you find out. Measuring temperatures from -22º to 590º F, all you need to do is point it at the area you want to check — a built-in LED will shine on the wall, glowing blue for cold areas and red for warmer spots. As for what you do when you discover a gateway to the underworld inside your home? That's up to you.