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A wristband seems like a much less obtrusive way to accomplish this goal (tracking tendons or muscles in the forearm) and would be great integrated with a smart watch.

This looks promising http://www.smh.com.au/it-pro/business-it/writing-in-the-air-...

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I know that some of the finger muscles run down past the wrist, but I don't think you could get precise tracking of fingertip locations with the wrist alone.

I got a Myo off Kickstarter that tracks impulses in your arms and that was a struggle even consistently recognising gestures.

https://www.myo.com/

Hardware looked great, on-boarding was solid, but in reality it was pretty disappointing and has sat in a drawer since day two.

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