Zircon MultiScanner 340 Electronic Wall Scanner/Edge Finding Stud Finder for Wood and Metal Studs/Metal Detector for Plumbing/Live AC WireWarning Detection to Avoid Hazards Zircon's MS 340 is both an edge detecting stud finder with metal locating capabilities to help you easily find studs and avoid hazards while mounting a TV, hanging cabinets, installing garage shelving and more! StudScan mode locates the edges of wood or metal studs up to 0.75 inches (19 mm) deep while DeepScan mode locates targets up to 1.5 inches (38 mm) deep Metal Scan mode detects both non-ferrous (non magnetic) metal, such as copper pipe, and ferrous (magnetic) metal, such as rebar. This mode can also be used to locate studs in lath and plaster walls by detecting the pattern of screws and nail heads in the studs WireWarning Detection indicates the presence of live, unshielded electrical AC wiring while scanning in StudScan, DeepScan, and Metal Scan modes One fully charged 9V battery, not included, is required for the multi-surface scanner to run at optimal performance