how metal detectors for treasure hunting work?

Those one used for detecting gold and silver treasures hidden underground. How it differentiates from iron metal?

The better metal detectors use better electronics and better wound coils. The null state, (no metal) is quieter and the ability to react to the magnetic susceptability of the individual material (inherent property) can be set to give a different tone. Iron is much more susceptable. (Takes less of a field to saturate the item.)

A Little treasure hunting with Treestandtimmy

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