Name of the tool to detect break in an invisible dog fence.?

Question

I am looking for the the name of that wand-like tool that you can use to walk around the yard and detect a break in the underground wire of an invisible dog fence. It works much like a metal detector only it emits a signal over the underground wire but when it comes to a break in the wire, the signal stops. How it knows this, I'm clueless...all I know is I want one but I can't get one if I don't know the name. Do you?

Answer 1

Buried line locator. they tend to be rather expensive. Find an electrician they will find it for about 75.00 the machine is about 700.00

Answer 2

when we had one you put a chock coil on tht unit in the house & use an FM radio.