Review on Sperry Instruments ET64220 Wire Tracker Wire Tracer: A Must-Have for Audio / Video Installers, Coax, CAT 5, Speaker & Phone, with Adapter Plugs (RJ-45, RJ-11, Coax & More) - Yellow by Christopher Hicks

I had to trace a 30 foot ethernet cable from my office through the attic to where my internet company installed my modem. I plugged in the device, ran my pen through the wires, and in less than five seconds realized they were 12 other wires stretching to different ends of my house. Fabulous! Saved me the expense of having an internet company ask their friend to charge a $150 service fee to literally do the same job, test something for a few seconds, and then plug the cable from the modem into my router. Has already paid for itself. I recommend it to everyone! Ease of use...good price...functionality. Enough.