DustyOldPile
Vinyl Goddess
Your smartphone can help!
Android: Strobily
iPhone: TrueNote
NOTE: The strobe patterns on some platters (like the Pioneer PL-550 / 570 and possibly some JVC models and others) will not correspond with the stock 60hz settings on these apps. You may need to calibrate the app with a known table of set speed. However, in the case of the two Pioneers above, they are both quartz lock and shouldn't be off to begin with. Or just use a paper printed strobe pattern)
Android: Strobily
iPhone: TrueNote
NOTE: The strobe patterns on some platters (like the Pioneer PL-550 / 570 and possibly some JVC models and others) will not correspond with the stock 60hz settings on these apps. You may need to calibrate the app with a known table of set speed. However, in the case of the two Pioneers above, they are both quartz lock and shouldn't be off to begin with. Or just use a paper printed strobe pattern)