I'm looking for the smallest mechanical encoder in existence that is readily bought. NOT one that is designed to be mounted onto motors like the one micromo/faulhaber sells as 'world's smallest encoder.'
It would be for a small hand-turned knob to tell software what position its being rotated.
The smallest I could find is this, but it is obsolete:
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Is there any at that size or smaller? Anything larger will not work. The body has to be 6mm wide or less.