FeaturesThis stud finder 3 in 1 stud center finder metal and AC live wire detector is a good helper when you decorate your home. Please choose to buy according to actual needs. Good PracticalityThe stud detector can avoid unnecessary losses when you want to dig a hole to hang a picture or install shelves and so on by locating hidden metal pipes, live wire,stud and wooden frames accurately. Three Detector Modes1. Stud Scan Mode: locates the edge of metal and wood stud in normal walls up to 1.5 inch (38mm). 2. Metal Scan Mode : locates the metal such as iron copper and aluminum pipe up to 3 inch (76mm). 3. AC Wire Scan Mode : locates the AC wire up to 3 inch (76mm). MultifunctionThe stud finder wall scanner is easy to find stud center. With auto shut off function. The LCD screen is easy to read for the backlight. You can buy and use with confidence. Professional DesignThis stud wall detector comes along with a audio and visual indication which allows you to make a mark easily when the metal AC live wire and stud is detected. Description: This stud finder 3 in 1 stud center finder metal and AC live wire detector is a good helper when you decorate your home. It can avoid unnecessary losses when you want to dig a hole to hang a picture or install shelves and so on by locating hidden metal pipes, live wire,stud and wooden frames accurately.