Testing TTUSB turntable speed using a multimeter

Can anybody here tell me how to test the speed of a Numark TTUSB turntable using a multimeter? The turntable should have a speed of 4500 khz (I believe is the specification). Where is the multimeter terminals attached to the turntable to conduct this test - at terminals on the motor inside the turntable?

Thank you for your attention on this subject.

Regards,

Don
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