StudPoPs tell you the EXACT spot where a stud is found...no more guessing. The StudPoP® "Original" is not like the other magnetic stud finders on the market which are nothing more than a magnet inside a piece of plastic. It is the world’s first moving magnet stud finder and is guaranteed to find studs in any kind of house, in any wall or ceiling. Unlike all other magnetic stud finders, the StudPoP "Original" doesn’t depend on you to "feel" the magnet tugging on a nail or screw. The StudPoP’s "popper" takes care of that for you. Once a metal fastener is detected, the StudPop's popper points straight out with a click. Only StudPoP products have this unique "popper" design that makes finding studs super easy and so much fun!