Triplett Fox & Hound HotWire 3388 Live Wire Circuit Tracing Kit with Tone Generator and Probe Triplett Live Wire Tracing Kit With True Trace Technology. Trace Wires Up To 1000Ft In Length And 3 Feet Underground With Adjustable Sensitivity And Tone. Tracer Has Built-In Noise Filter And Led He Manufacturer name - TRIPLETT Tracer has built-in noise filter and led head