Zircon's TriScanner Pro SL uses advanced scanning technology to find metal (rebar, pipes), studs and joists behind walls, floors and ceilings. The AC detection locates hot, unshielded AC wires in all modes. DeepScan mode scans through up to 1-1/2-Inch (3.8 cm) of concrete, drywall, plywood and most flooring to locate wood and metal studs and joists.