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<blockquote data-quote="Guest" data-source="post: 101619"><p>A DD coil will make a low tone on surface junk down to a certain depth when it turns into a high tone so in theory if you raise the coil over a low tone and it turns into a high tone it should be junk if it stays a low tone it should be something that would give a coin like signal but watch out for those aluminium tops'</p></blockquote><p></p>
[QUOTE="Guest, post: 101619"] A DD coil will make a low tone on surface junk down to a certain depth when it turns into a high tone so in theory if you raise the coil over a low tone and it turns into a high tone it should be junk if it stays a low tone it should be something that would give a coin like signal but watch out for those aluminium tops' [/QUOTE]
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