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Doing a double-bladed one would be the same principle, but with an “emitter” on either end instead of a pommel on 1. And you’d need a switch for each LED, but you can probably run both off the same battery… I don’t know enough about electronics to be sure about that part.
Because G to B is 4 half steps; on the other strings (E to A, A to D, etc.) it's 5 half-steps. This is for doing relative tuning only. It's better to tune each string individually with a tuner.
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