The 3375 Fox & Hound Jr wire tracing kit consists of a versatile Fox Jr Tone Generator (Toner) and a compact Hound Jr Inductive Amplifier (Probe). The Fox Jr is a battery operated handheld multi-function Toner that generates a Warble tone, performs some basic telephone line tests (loop mA, line polarity, and ringing voltage), provides a visual and audible continuity test, and provides overload protection up to 120 VAC. The Hound Jr is a battery operated handheld lightweight Probe, with a thumb-wheel Sensitivity control and Signal Strength indicator LED. The Fox & Hound Jr are designed to work in various industrial and residential applications.