1Stud detector, mainly used to detect metals and nails, small and compact, easy to carry. 2Builtin magnet, free your hands to hang on the wall when fixing the rivet, you can also hang on the wall with a rope. 3No battery, builtin level meter, easy to mark, measure whether the liquid level is in balance. 4Ergonomically designed, the soft handle is easy to grasp and easy to operate. 5Suitable for all gypsum board applications, for newer lath and plaster wall as well. Item Type: Stud Finder Material: ABS Weight: Approx. 70g / 2.5oz Product Size: Approx. 10x3.7x2cm / 3.9x1.5x0.8in Purpose: To detect metal and nails, use as a level How to Use: 1. Stick the side with the magnet on the wall, when it encounters something with iron, it will automatically attract it 2. To detect whether the plane remains level, use a stud detector to stick to the plane and observe the position of the blisters to see whether the plane remains a level 1 x Stud Finder