Strobe disc for turntable speed checking
thingiverse
These strobe disks are designed specifically for fine-tuning your turntable's speed, assuming your model doesn't already have this capability. By inserting the correct disk and rotating your turntable at 33-1/3 or 45 rpm under fluorescent or similar lighting with a frequency of 50 or 60hz, such as neon, the dark bars on each disk will appear motionless.
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