This center detect Stud Finder from DEWALT has a detection depth of 1-1/2" for wood and metal. Traditional stud sensors locate the edge of the stud, butthis one locates the center for a more efficient read, even when held at an angle. Plus, it is constantly calibrating to save time during use. An audible alert and directional LED arrows clearly notify you once the stud is located, and you can easily mark the center of the stud with the center marking channel. | DEWALT 1-1/2" Stud Finder DW0150