Multi Wall Scanner, Detects Wood Studs, Metal Objects Including Rebar, Studs, Steel & Copper Pipes, Live Wiring, Latest Three Sensor Technology Offers A Wide Range Of Detection Performance Up To 4-3/4", 121 mm Deep In Cured Concrete, 3 Selection Modes, Wood, Metal, AC Wiring, Automatic Calibration For Easy & Precise Detection, Illuminated Graphical Led Display Indicates Mode, Detection & Strength, Audible Detection Signal With On/Off Button.