This may be a dumb question but can someone give me a layman description of when you would use ferrous coin vs high trash? I notice on FC I can get double signal separations but many times I get one low in iron at bottom right and one around penny range but once I dig the iron both symbols are gone. Usually ends up being a rusty nail. On high trash this same item looks more like a scattered line crawling from bottom right to penny/coin area around 12-34.
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