Tone Generator and Probe Amplifier Tracing Kit - 

The 701K-G tone and probe kit offers superior tracing for low voltage applications such as telephone, data, and security alarm wiring. Suitable for the internal wiring technician, the kit provides the ability to check voltage on wire pairs as well as generate a tagging tone along the wire which is then picked up by the tracing probe. It features an LED headlight in the tracing probe, a headset jack, short circuit beeper, and external warble-select and promises to provide tracing and identifying single conductors or cables within bundles, either at midpoint or at remote ends.