Here is a metal detector that connects to your phone via headphone jack and helps you go treasure hunting or inspect vertical surfaces such as walls. The AKYOR CSP86 comes with a 20cm diameter coil and weighs 2.5oz. It has special target programs for gold, silver, ferrous, and non-ferrous materials.
The device doesn’t need an external battery and looks fairly easy to handle. Expected to cost $90.[Source]
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