I hadn't heard of the belt before, but I'd seen a number of those at the Polytrauma conference last year. In addition I've heard of people embedding rare earth magnets in their fingertips, enabling them to sense electric fields -- very useful for someone like me! (I've pondered the idea of a ring, but to sense the field through that, it'd have to be strong enough that I'd probably be a danger to my equipment and magnetic media...)
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