Rowley Professional Stud Finder. # 1 Choice of Homeowners and Professionals! Want to hang that TV, picture or cabinet? Then you found the right tool. Finds studs fast! Just run the tool back and forth across the wall using the 16" beaded chain. It couldn't be easier! When the stud is located the high powered magnet sticks to the wall. It will locate both wood and metal studs. The convenient 16" beaded chain can be used to locate the next studs as they are generally 16" apart. NO FALSE READINGS! EASY TO USE!