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, StudPoPs don'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. For extra accuracy, this bundle also comes with 9" On the LEVEL that is powered by 2 'Pops. It quickly locates stud edges & center and its integrated push pin keeps it on the wall for hands-free convenience. Only StudPoP products have this unique "popper" design that makes finding studs super easy and so much fun!