“Smart” hammer

Source:Funny Patent – One Patent One Day

It’s very easy to nail on a light body wall. If only nailing in the weak part of wall weak, not only the nail cannot bear the weight of the hanging things, but also may damage the wall. This is the “smart” hammer,has a sensors on the rear designed to detect light within the body wall studs location. Small red lantern flashing after detecting of location, you only need to mark the point with a hammer tail, and then steadily nail in the wall bone.