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Motor Drive Controller with Digital Reading

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Hey guys,
I'm looking for a Variable-speed motor drive controller that comes with a Digital RPM Reading.

I've been googling and looking into all sorts of Controllers such as Variable Frequency Drives or Phase Locked Loop circuits, but how do I find one that would actually show me the RPM Reading.

If there is not such a unit then how would you suggest me to assemble one without spending too much time (using Digital Panel Meters, Tachometers, Variable speed drives or something like that )

Any help is greatly appreciated.
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