Details: Product Description CH Hanson 03040 Magnetic stud finder Amazon.com The Stud 4 Sure is a stud finder that uses powerful rare earth magnets to pinpoint the exact location of screws or nails in a stud. The tool doesn’t require batteries and never needs calibration. By keeping the tool free of moving or electronic parts, the Stud 4 Sure is easy to use and fits easily into any tool pouch. Just place the stud finder on the wall and sweep in an S pattern to locate any metal fastener. The rare earth magnets are strong enough to allow Stud 4 Sure to hang hands-free on a wall, eliminating the need for pencil markings. The ergonomically designed, China made product is guaranteed to last a lifetime of being tossed, dropped, and banged around. From the Manufacturer Positively locates nails and screws with powerful neodymium magnets. The magnetic stud finder works like magic. It sticks to the wall leaving your hands free–no batteries, no calibration, no lights, no hassle. It works on wood or metal studs, and uses multiple industrial strength magnets to “Field Vector” the stud. This is the last stud finder you will ever buy. Simply slide the flat surface of the magnetic stud finder slowly across a wall in a circular or S motion until you feel a strong pull to a nail head or screw. Once you have the magnetic stud finder directly above a nail head or screw, let it go and it sticks to the wall.