I thought this was a neat thing I saw on another metal detectorist's blog: How to Make a Metal Detector Out of A Calculator and a Radio!
http://www.howcast.com/videos/25387-How-To-Make-a-Metal-Detector
As a side note, I just thoguht of how green this is! While not all entirely practical, this is a great way to demonstrate reuse of items and their creation into other functioning goods. Especially for Elementary School kids, this would be a very neat project. Not only will you be recycling and reusing, but once you go try it out, you'll be removing debris from the ground! Enjoy!
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