I just had my first experience with an Armada product yesterday - a Pro-600 I think. What a great tool! It sure beat digging up my yard. I'm just a homeowner but I need one of these!!!
Copper would work, in order to track a metal pipe you would need something like our Pro65 or some fish tape to put into the pipe and ground it on both ends. You could then hook your locator up to that and track from there.
