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Reply to "Tachometer"

I found some videos demonstrating the use of the pen tachometer. Looks like it is best for combustion engines, and there were certain formulae to use based on 2 or 4 stroke. Very interesting from an historical perspective. While not very accurate today, I am always impressed at innovation from any era.

On another note, I have an old anemometer I may play around with to see if I can use it for RPMs.

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