The 26200900 Fluke Networks Analog Tone Generator is your best choice for toning and tracing wire on non-active networks, and specifically for identifiying idividual pairs with SmartTone Technology. Used with the Pro3000 Tone Probe you can tone and trace wire on non-active networks. Sends tone up to 10 miles (16 kilometers) on most cables. Comes with angled bed-of-nails clips that allow easy access to individual pairs and the RJ11 connector is ideal for use on telephone jacks. Must be used with the Pro3000 tone probe.