Green backlight for easy reading in dim spaces Metal depth indicator estimates how deep metal objects are behind a surface Low voltage indicator alerts to nearby electrical wiring Purpose: Quickly locate wood framing, metal objects, and AC wires hidden in the walls, floors, and ceilings of a house It can work on flat surfaces, wallpaper, wood floors, acoustic ceilings, painted walls, and other places Helps prevent danger when installing televisions, cabinets, garage racks, and similar fixtures What it does Locates wood framing, metal objects, and AC wiring behind walls, floors, and ceilings Where it works Suitable for use on flat surfaces, wallpaper, wood floors, acoustic ceilings, painted walls, and other locations in a typical home Why it matters Reduces risk of damage or injury by revealing hidden wires and studs before drilling or screwing Use scenarios Mounting a wall mounted television: identify studs and avoid wiring before drilling Installing cabinets or garage racks: locate metal objects and electrical wiring to plan anchors safely Home renovation: map wiring behind walls before cutting or demolition