I love my Fluke Intellitone because it can trace and map live network wires and it has paid for itself many times but,since it's "digital" it's a little weak when the wires can't be touched.
I use my Progressive 200FP with a Tracer 2 to locate wire burried in walls. Compared to the Fluke,it's limited in everything else BUT,it it will find wires quite well in walls and get you within an inch or two of the actual location.
Every day is a good day.......some are just better than others!
Proud to say that my property is protected by a high speed wireless device!