The
tone generator injects a signal onto the cable to be traced. Typically it's a Square wave (with high harmonic content), or a warbling
tone. The
probe tool is usually called an Inductive Amplifier, but in reality it
works by capacitive coupling from the
tone injected onto the wire.
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The Tone & Probe Test and Trace Kit provides simple toning and tracing of non-energized wire. It includes Tracing Probe, Tone Generator, RJ45 Cable, RJ12 and Alligator Clip Cable, 4 x AAA Batteries.