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Here is how I use the iron mask. When I am looking for jewelry or coins I use the factory preset for iron mask. Therefore when my coil passes over any Iron objects, I hear a null between the threshold hum. The good targets will have tone ID. I still know that iron is present because of the null. Especially in trashy areas full of iron, nails, and other trash, it eliminates some of the unwanted signals. When I am relic hunting, I hunt wide open with NO iron mask, thus the ALL METAL MODE. An example; with iron mask on and My coil passed across a cannon ball, there would be a brief null between the threshold. With iron mask off, and in the all metal mode, their would be an audible tone and the digital reading would probably be 31-26. With iron mask on any targets that fall into the iron readout range on your screen, will not sound off. if you check your smart find screen the iron signals will hit to the left of the screen. Hopefully I have helped you. I am fairly new to detecting so, if I missed a few things maybe SNOWY or some of the other seasoned Vet's can help
Happy Hunting Grounds, 
