Green Lee-811K-Digital-High-Performance-Tracing-Cable-&-Lead-Finder-Greenlee-52047385-P-The-Greenlee-811K-Digital-High-Performance-Tracing-Kit-is-a-wire-&-pair-tracing-tool-that-is-both-universally-compatible-&-virtually-noise-immune-Whether-tracking-wires-in-a-clear-&-quiet-location-or-trying-to-find-a-wire-in-an-area-roaring-with-power-hum-&-digital-crosstalk-the-200XP-probe-&-77GX-tone-generator-work-efficiently-The-tracing-pair-is-also-capable-of-working-with-any-older-typ