Zircon MetalliScanner m40 Handheld Electronic Metal Locator: * Use wide scan to detect metal in walls or concrete * Use pinpoint scan to locate small metal objects such as screws and nail * Locates ferrous (magnetic) metal up to 4"D * Locates non-ferrous (non-magnetic) metal up to 2"D * 2 scanning positions, each with a progressive LED display * As it approaches a metal object, the red LEDs progressively light from the bottom up * Top lighted blue coil and an audio tone indicate when a metal target is located