C.A.T. Cable Avoiding Tool this locator picks up "current " in gas lines underground pipes, telephone, fiber optic, copper and aluminum wire and others.

Anyone in the underground business needs one of these. They have saved my butt many times finding known and unknown utilities. 

Tethered speaker earpiece allows you to hear signal while working around loud equipment.

I will be happy to demonstrate how it works. Be sure to check out my other locators and Gennys.