If so many folks are coin shooters, and so many of them want silver/copper coins............. Why do the major detector companies not make machines dedicated to this focus ? Like a 3 kHz machine or whatever. Companies need to cover as much market share as possible, so the machines need to be more or less generalized, to a certain degree ? I beleive that I have seen different frequency coils, is this how some folks do this ? And why can they not make a machine adaptable to go from low kHz to high ? I know nothing about electronics but I believe that some Minelabs are multi frequency, are they not ?