Just want to know if any one can help me on air test for gold nuggets or a average depth of a 705. I am currently looking for a used one or new one that some one would trade me for a gold bug se version 3 and some cash. How dose it work in all metal mode? is their a iron mask or dic with the machine in prospecting mode? I just have so many questions i want to ask bout the machine. All i here is mine labs are the best and easy to use. Just want some pointers jess.