1.Ergonomically designed 2.Automatic calibration 3.Pencil line to easily mark location of stud edges 1.It is used to find the wood, metal studs and joists , AC live wires when you are doing the following jobs: a. Hang cabinets and shelves securely b. Hang pictures and mirrors c. Install ceiling fans and chandeliers d. Install drapery rods and closet organizers e. Install plant hangers, towel bars ...