2756-5100 Features: -Scanner.-Quickly and easily locates studs, metal, and hot electrical wiring.-behind walls, floors, and ceilings.-4 mode switch makes it easy to change functions while the easy to read display screen, SpotLite pointing system, and audio alert identify targets instantly.-Patented TruCal technology calibrates to any wall"s density and TruCal icon alerts the user when the tool is calibrated and ready to scan. Dimensions: -AC scan finds and traces live, unshielded electrical wire up to 2" deep.-Metal mode locates non ferrous metal, such as copper pipes up to 1-1/2" deep, and ferrous metal, such as rebar, up to 3" deep. Disclaimer: -WireWarning detection indicates the presence of live, unshielded electrical wire up to 2 " deep in stud and metal scanning modes.