gordygroover said:You will be surprised what different tones the unit makes over different targets also. Pretty quickly you will not bother to look at the screen. Your ears will be able to guess just about as well as your machine does.That is pretty much what all machines do anyway. Just guess at what is in the ground based on interpreted clues.
I am no expert, but to me I only hear 3 different tones on my 250, low for iron, midtone for Nickle threw and foil, and dingding for penny on up. Do you hear more than 3 tones?