Zircon MultiScanner i320 OneStep Center Finding Stud Finder with Metal Scanning and DVD How-To Guide: * Quickly and easily locates wood and metal studs and joists * Locates metal targets up to 3"D * 3-mode switch makes it easy to change functions * Display, SpotLite pointing system and audio tone all indicate the location of the target * Signal strength indicator helps distinguish between shallow and deep targets * WireWarning detection works continuously in all modes * Indicates the presence of live, unshielded electrical wire up to 2"D * ACT (Auto Correcting Technology) corrects common user errors automatically