Zircon MultiScanner i520-FFP Center Finding Stud Finder with Metal and Live AC Wire Detection Zircon's MS i520 is a multi-surface scanner with 4 modes that detect studs, metal and live AC wiring to help you easily find studs and avoid hazards Both StudScan and DeepScan modes locate the edges, center and direction of wood or metal studs; Metal Scan mode finds both non-ferrous metal (such as copper pipe) and ferrous metal (such as rebar); AC Scan finds and traces live, unshielded electrical AC wires WireWarning Detection indicates the presence of live, unshielded electrical AC wiring while scanning in StudScan, DeepScan, and Metal Scan modes ACT (Auto Correcting Technology) automatically corrects common user errors, such as when scanning begins over a stud, while the Patented SpotLite Pointing System clearly indicates the target location One fully charged 9V battery, not included, is required for the multi-surface scanner to run at optimal performance