The Klein Tools VDV500060 Probeplus Tone Tracing Probe traces wire paths and identifies cables in common wiring systems, and is designed for use with Klein VDV test tools: VDV500-051, VDV526-054, VDV526-052, VDV501-053, VDV501-809, and works with many other manufacturers' analog tone generators. This model features digital volume control and loud built-in speaker.