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Viking Metal Detectors

Why Is It Not Possible To Only Find Good Items?

Unfortunately a metal detector is not able to distinguish items as being 'worthless' or 'valuable'. It can however determine the conductivity of an object. Objects of low conductivity, such as iron, can easily be distinguished from a silver or copper object, which has high conductivity.

The problem occurs in the so-called 'grey' area in-between. For example a 9-carat gold ring and a ring pull can appear very similar to a metal detector as they have a very similar conductivity.