Stud Finder, Multifunction Edge-Finding Scanning & Large LCD Display & Warning Detection for AC Wire/Metal/Wall/Studs Wood (black) 3 IN 1 DetectionEasy and precise detection with automatic calibration, there are three modes to select: wood studs, metal objects (rebar, studs and steel/copper pipes) and live wire. Higher Efficiency it can locate the edges of wood or metal studs up to 3/2" (38mm), metal rebar up to 3"(76mm) and AC wire up to 2"(51mm). Easy to useOnly three buttons, first press ON/OFF power button, then select the Mode Switch Button, after that just press the Scan button(at the left side of the device) and scan horizontally across the object surface. Intelligent design Large LCD digital display with illuminated graphical and sound signal indication. After about 1 minutes of non-use, the tester automatically performs a power off to save batteries. MEET ALL YOU NEEDPackage includes 1x stud finder, 1x 6F 9V battery and 12-month warranty and lifetime friendly. It is lightweight and has ergonomically designed one-key-operate handle.