The Southwire™ Amplifier Probe can be used with any tone generator to quickly trace non-energized cabling. It is powerful enough to trace cables behind walls, yet sensitive enough to identify individual conductors. It provides positive cable detection, changing tone when wires are shorted. Amplifier Probe, For Any Tone Generator This product contains a chemical that is regulated under California Proposition 65. Warning: This product contains a chemical known to the State of California to cause cancer. Warning: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. -