The Zircon electronic metal detector is a wide and spot scanning tool that allows you to quickly and easily detect metal in wood, drywall, paneling, tile, plaster, plaster, concrete and other non-metallic surfaces. Its capabilities can detect magnetic ferrous metal up to 4 inches deep and nonferrous non-magnetic metal up to 2 inches deep. The tool has two scanning positions with a progressive LED display: a spot scan allows you to detect small metal objects such as screws and nails, while a wide scan is designed to find metal in walls or concrete. As you approach a metal object, the red LEDs light up progressively from bottom to top, the top illuminated blue coil and an audible alarm informs you that it has been detected.