Magnetic Stud Finder Accuracy 2 mm/m Overall Height 1 5/8 in Batteries Required Batteries Not Required Overall Width 3 1/4 in Overall Depth 1 3/8 in Materials Detected Ferrous Metal Battery Type Not Applicable Scan Depth for Ferrous Metal - Maximum 1/2 in Scan Depth for Wood - Maximum Not Applicable Scan Depth for Live Wire - Maximum Not Applicable Features Reflective Backing Increases Vial Visibility Scan Depth for Non-Ferrous Metal - Maximum Not Applicable Functions Not Applicable