My F75 Standard has been correct 100% when identifying....

[Roland58]

Foil, that is. In my feeble attempt at finding something gold.....I find only foil, but, my F75 is right on the money!!

[Lowbatts]

No experience with the F75, but my F70 has some erratic features that may interest you. Sometimes it will indicate lower target categories such as those in the foil to tab range and it will lock in, fairly solid numeric value.

Well out pops a large cent or an early IH, or even a shield nickel. But yeah, that gold is hiding somewhere else in these parts too for the most part.