Hanging a frame, mirror, or shelf is easier with a Made in the USA magnetic stud finder and level tool that doesn’t need batteries or calibration to do the job. Slide it along the wall and the indicator will pop up and click when it detects a stud. Magnets in the tool can find metal fasteners on a stud up to half an inch deep in the wall, and it has a built-in hole for you to mark the just-right spot to hang.