A toner probe, which is shown in Figure 22.6 below, is a tool that can track where a wire is going. This is useful in large environments to identify both ends of a wire and track cables (usually from a bundle of wires). The toner probe consists of two different pieces:
- A tone generator: a battery-powered device that taps into the connection and sends a signal on the wire
- An inductive probe: allows you to hear the generated tone without even touching the wire