Blindly routing wires behind walls and through ceilings can be a tricky task. Electrician Henry Sanchez of Ercole Electric, Gaithersburg, Md., uses a digital camera to extend his vision behind walls and into the joist spaces where he's working.

Sanchez either uses the hole he's cut for wires or, if need be, cuts another. Then, he inserts his camera, points in the direction he needs his wires to go, and takes a shot. He sees instantly whether the path is clear or, if it's not, where the obstructions are. Using the camera's zoom lens when routing over an extended distance, Sanchez gets a better picture than he would with just his eyes.