Zircon MultiScanner i700 Center-Finding Stud Finder with Metal and AC Electrical Scanning and DVD How-To guide Locates the edges and center of wood or metal studs up to 1 1/2-Inches (38 mm) deep Scans for metal and live AC wires Easy-to-read LCD display, audio tone, and the patented SpotLite Pointing System indicate stud center Built-in eraseable marker makes one-handed operation easy Metal and AC Electrical Scanning and DVD How-To guide