By applying a tone signal to a wire pair or single conductor, and using an inductive amplifier probe, the tone generator permits technicians to identify that conductor within a bundle, at a cross-connect point or at the remote end. These generators can be used on twisted pair wiring (telecom, datacom, etc.), single conductors, coax cables, de-energized AC wiring, etc. Provides the four basic functions of tone signal, continuity testing, talk battery supply and line polarity confirmation.