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The object was an old square nail at depth of 8 inches. These very often give false non-ferrous signals which are detected typically away from the pinpointed object.
I also demonstrated the constant non-ferrous tone the pro-find 35 gives using my brass towel clip.
Minelab Equinox 800 with 6", 11", 15" coils.
Minelab Pro-find 35, Garrett Pro Pointer AT, Nokta Waterproof Pointer.
ALL THE GEAR, NO IDEA!
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It seems quite reliable in distinguishing between the two, but the pointer needs to be almost touching the target before it'll register as non-ferrous, so you might as well have a look anyway. I wrongly assumed before purchasing, that it would register as ferrous/non-ferrous from further away.