Was hunting with a friend with an e trac and he got a barber dime at 3". I usually don't dig anything under 4" due to most likely being clad ,unless numbers are hi 40's. I asked him how did he know it was silver ,and he said by the tone. He threw a clad dime ,along with the barber on the ground and he demostrated the different sound. I hunt in combined ,then I tried 50 conductive to sound like the e trac ,and I could not tell any difference between the two dimes. I also watched a video by Dr tones ,and I can't figure out what he was actually doing. Wasn't sure if he meant he was holding the pinpoint button while checking at a 90 degree angle ,and then when the ferrus # changes to 13 then it probably is silver??? Not really sure. If anyone has other ways of telling difference between clad and silver ,besides digging every 3" Target, would be very grateful.....hiluxyota.