The Paint Spy Accident Detector is a high quality, precision-built tool that quickly reveals hidden body damage, repaint or rust repair. Used by automotive professionals, its Neodymium Magnetic Technology senses the thickness of car paint and tells you within minutes if there was previous damage. It is a powerful tool that will take the guesswork out of inspecting a car. With its compact size, the Paint Spy can be easily carried in a pocket.
Link: Paint Spy