5 in 1 MULTIFUNCTION | 1/2 stud scan, 1 stud scan, 1.5 stud scan, metal scan; AC scan. Locates wood, metal studs, joists, beams, metal pipes, rebar; live AC wire behind walls, floors and ceilings quickly & easily LCD DISPLAY; SOUND WARNING | Large LCD display; sound warning help detect the accurate location of the objects. Saves lots of time by displaying the desired stud center; the precise position of the stud AUTOMATIC CALIBRATION | Turn on the stud finder and complete calibration by placing it on the wall. The detector will flash and beep once it has picked up the edge of a stud. Automatic calibration before using provides maximum reliability; accuracy AC WIRE WARNING IN ALL MODES | This stud finder will indicate the live AC wire in all modes to avoid potentially serious mishaps. No fear of drilling into a live wire. No worry for safety hazards in Construction ERGONOMIC DESIGN; HIGHLY COMPATIBLE | The rubberized ergonomic grip can be hold by hand comfortably. Convenient to use in home, office, workshop. Makes all DIY home projects easier such as mounting TV, bathroom cabinet, photo frame, garage racks etc.