Well thanks to Richard at Backwood Detectors I have a basically new White's TDI on the way. Just got the UPS tracking number. I will be using it in the Az. gold fields and reporting back what I find out about the machine and what I find with it. Any pointers from experienced used would be appreciated. I am reading and rereading the manuals downloaded from white's site. I need to hit the ground running and looking for any help I can get. I am new to the PI machines but not to detecting.