Item Type: Stud Finder Material: Plastic, Metal Size: Approx. 8.8 x 2.1 x 1.9cm / 3.46 x 0.83 x 0.75in Package List 1 x Metal Scan Finder 1Strong Magnetic Force: Wall stud scanner does not need batteries, provide the rare earth magnetic with 27 pounds of pull, which is simple to use. 2Fast Detection: Stud finder wall scanner can find 40 or more steel studs on a wall or wood frame with the thickness of 5/8in in less than a minute. 3Accurate Position: No need to make any marks on the wall, the magnetic stud ball can be directly positioned and fixed at the accurate position. 4Wide Application: Wall stud detector can easily detect metal through up to 5/8in wall, wood frame or other thicker building materials. 5Multifunction: Wall stud finder can find some small metal objects that fall on the ground, or tie a long enough rope to pull up metal objects that fall off.