Easily detect wood, ferrous metal, non-ferrous metal, plastic and unshielded live electric behind wall surfaces up to 3" deep using this DEWALT Hand Held Wall Scanner (DCT419S1). It's capable of scanning through multiple wall surfaces including drywall, plywood, concrete and ceramic tile, and boasts a 3.5" LCD display for improved visibility and communication of object type and location. Plus, the tracking bar displays embedded material locations of the entire mapped area, up to 9.8'.