switch your ET to ferrous/2 tone and you can tell by the numbers with no squeal. I hunt almost exclusively in the relic pattern and ferrous/2 tone. It works very well for me. Yes, I have to look at the screen more but it works very well. I keep it on the digital screen because on the ET, the smartscreen is useless, since the conductive line is fixed and the cursor no longer jumps around. The conductive number tells the tale.
I think Larry is right about the V3, it is in the TID number.
Then agian, you could use a SovereignGT... I took mine out yesterday to practice on nickels and pulltabs and learned something I did not know... but I bet others did... in disc, if I move the coil about 3" back and forth over a square tab, either straight or folded over, it will warble just a little... swing the whole coil and it will sound good. Swing over a nickel with a 3" swing and it does not warble at all... the numbers and tone ar the same, or close enough to make one dig... but that little warble gives it away.
I will still use and learn my V3 and use my E-TRAC but I am going back to using the Sovereign more too... I don't think that there is another detector that tells you more through the audio... (I like hunting by audio, just not with the ET). I think that the V3 is a more visual detector too. There are people who hunt with a Sovereign with no meter and can usually tell you what is under the coil just by the audio... some can do that with a Tejon and I don't see how... but they can hear a bullet at 20"... from the faintest of audio changes and the disc knob.
J
Julien