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I have built a device that has a spinning rotor that I would like to display its rpm. I have been using a handheld laser device that bounces off a reflective strip on the rotor (see pic). I’m looking for a permanent module attached to the base plate with a small display unit I can mount and with any electronics put on the PCB I’m preparing. Magnetic options are complicated as the rotor has 5 Neo magnets in it so an optical method is preferred. Any ideas? Thanks