This Wise Hammer contains a stud finder as well as a heavy metal bit for hitting nails. Hold the handle up against the wall, watch for the flashing light and bleeping sound and then bash your nail into the centre of the stud every time. Genius? $29.98.
To find stud edges, place the butt of the handle against a wall and move it until the red light flashes and hammer beeps. Use the built-in nub to mark the edges to pinpoint the stud center. Hammer the nail and you’re finished! Uses one replaceable button battery, included.