Stud Finder, Accuracy +/- 1/8 in, Overall Height 5 3/8 in, Batteries Required Batteries Required (Not Included), Overall Width 2 1/4 in, Overall Depth 1 5/16 in, Materials Detected Ferrous Metal, Plastic, Wood, Battery Type AAA, Scan Depth for Ferrous Metal - Maximum 2 in, Scan Depth for Wood - Maximum 1 in, Compatible Surface Material Drywall, Scan Depth for Live Wire - Maximum Not Applicable, Features Shows the Precise Center of the Stud, Scan Depth for Non-Ferrous Metal - Maximum 2 in