A tone generator and probe tool is used to trace a cable from one end to the other. This may be necessary when the cables are bundled and have not been labeled properly. This device is also known as a "Fox and Hound" or "toner and probe." The tone generator is used to apply a signal on the cable. The probe is used to detect the signal and follow the cable over ceilings and through ducts or identify it from within the rest of the bundle.