Stanley 77-050 9 in. L X 4 in. W Stud Finder 3/4 in. 1 pc

The S50 stud finder detects wood and metal studs up to three quarters of an inch below surface material and features auto-calibrating AC detection. With a sturdy design, this stud finder indicates when it senses a wood or metal stud below the wall surface with sequential LEDs marking both the edges and center of studs with accuracy up to 1/8" for wood and 1/4" for metal.