Fox & Hound™ HotWire™ with a product number of 3388 is a type of live circuit tracing kit. It comes with a Fox HotWire™ Tone Generator (Toner) and a Hound HotWire™ Inductive Amplifier (Probe).
The Fox HotWire™ has a low voltage tracing which is powered by a 9 V battery. It produces multiple tones such as pulse or warble. It gives a visual and audible continuity test. It has a battery test LED. The device can be powered by a battery or an AC line.
Meanwhile, the Hound HotWire™ is a battery operated handheld lightweight probe. It has a rugged design and moisture resistant. It has an LED signal strength indicator. Its LED is designed to lighten dark places and lessens the fluorescent light noise.