hi, i normally use a hammered farthing and a roman minnim as test coins i have them in flower pots in the back garden both burried a few inches down. ithen turn up the discrimination to see when they no longer give a signal which if i remember rightley was a little way into the pulltab section(have just Sold the trident so i can't check it again) you may have to listen to some iron but you will be confident you won't miss much.
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