Zircons Multi Scanner Pro SL is the goto tool for all subsurface scanning projects It easily & accurately locates the edges of studs joists & metal It also locates & traces live electrical wire A 4mode switch provides instant access to all functions A wide LCD array indicates an approaching stud A full LCD arrow audio tone & Spot Lite Pointing System alert users when stud edges are located Stud Scan finds metal or wood studs & joists up to 19 mm deep Deep Scan mode doubles the scanning depth to 38 mm Metal mode detects metal studs plus copper aluminum & iron pipe up to 38 mm deep & rebar in concrete up to 76 mm deep AC Scan finds & traces unshielded live electrical wire up to 76 mm deep Patented Spot Lite Pointing System & audio alert identify targets instantly In wood or metal modes Wire Warning Alert identifies the presence of hot electrical wiring Patented Tru Cal technology calibrates to any walls density & a green LED Tru Cal light alerts the user when the tool is calibrated & ready to scan