What are the limitations of treasure hunting metal detectors?

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Treasure hunting metal detectors face limitations in discriminating between ferrous and non-ferrous objects, as well as ground minerals. The effectiveness of these machines largely depends on their field strength and frequency settings. Higher frequencies can improve sensitivity to small objects, while lower frequencies may better penetrate mineralized soils. The design and technology of the detector play crucial roles in its performance. Understanding these factors is essential for optimizing treasure hunting efforts.
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This is a tresure hunting MD, the design needs a way of discriminating from ferrous, none ferrous objects, and minerals in the ground, what are the limits
of such a machine ?
 
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