Measuring Turntable Platter Speed


I have an older Rega P2 that seems to warble (for lack of a better word) when playing. It's not that it's fast or slow, but I can hear slight, quick, pitch changes when playing a record. I put a new belt on, but no change.

Is there a method or relatively inexpensive instrument that I could use to monitor small fluctuations in platter speed?

Thanks in advance - Jim S.

stilljim
Post removed 

I use the Clearaudio strobe disc. I think it is somewhat expensive, but you can use either side, one for standard household lights, or the other side with the optional Clearaudio strobe meter, which is definitely expensive. 
 

https://elusivedisc.com/clearaudio-stroboscopic-speed-test-record-strobe-disc-180g-lp/

Thanks guys/gals.

 

audioquest4life - If I read the literature correctly it measures average platter speed which doesn't address the small fluctuation problem I perceive. 

 

big_greg - Nice suggestion. I might try the platter, but he stroboscope is a quarter of the price of  a new P2. So I don't know. 

I was just trying to confirm what I am hearing is actually true. You never know, faulty hearing, big imagination?

Jim S

The Clearaudio has groove that tracks the cartridge and its drag on the record 

to give you a more accurate reading