If you think all magnetic stud finders are the same, think again. This high power, no-batteries-required stud finder uses two super high strength, high tech neo-dydium magnets instead of the wimpy little permanent magnets used in most magnetic stud finders. The result is a tool that will reliably find a drywall screw or nail (or even a steel stud) quickly, and then hold itself to the wall, making it easy to keep stud locations obvious. This finder is so powerful that when I placed it on my desk, it quickly repositioned itself over the metal drawer slide underneath the 1-inch thick top! Made in USA.