General Tools' CL10 Cable and Pipe Locator makes it possible to see into walls. The tool consists of a transmitter and a receiver; the transmitter applies a frequency to metal pipes and cables, rendering them "visible" to the detector, which the user slides across the wall like a stud sensor. An image of the pipe or wire being traced shows up on the transmitter's screen. The tool can also be used to isolate breakers and locate obstructions in pipe, and the detector will function as a traditional voltage meter.
¦ Price: $250. 800-697-8665. www.generaltools.com.