Simple Arduino Metal Detector: Metal detection is a great past-time that gets you outdoors, discover new places and maybe find something interesting.
from Google Alert - metal detecting great finds https://www.google.com/url?rct=j&sa=t&url=http://cauo.kleinanzeigen-webwerbung.de/how-to-remove-rust-from-metal-detector-finds.html&ct=ga&cd=CAIyHGQxYTc0ZWJmMDQxMjk0NzA6Y29tOmVuOlVTOkw&usg=AFQjCNGX-FyF9hQG5b3zeFbNWC6M7atv7Q
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