Measuring turntable speed


Happy Holidays everyone!  This has probably been discussed before but I'm of the age that makes me a bit of a Luddite.  I have a VPI Scout and SDS.  I use "The Ultimate Analogue Test LP" to play the test tone and (at least I used to) the app Dr. Fridrekson(??) had other there.  It mysteriously disappeared from my iPad and I can't find it anywhere.  What are you using?  Thanks!
scarlson
Another vote for the “timeline” it will scare you to know how far off many tables are!
big_greg, great find! for $16 does the same thing a Timeline does for $400. I ordered one and will report back.
@mijostyn I'd be curious to see how accurate it is compared to something more expensive.  I paid full price for mine, all of $25 I think.  I had a problem with mine a while after I bought it and they sent me another one immediately, no questions asked.  Great service.  I also like their cartridge mounting kits a lot.  
I have an industrial rpm/ fpm etc etc strobe that I use for work.
It has two modes, contact with various size wheels and strobe non contact very similar to the one Greg linked to.
It is EXTREMELY accurate.
But for a test I also just ordered one of them at $15 so I can compare to my industrial unit.
Will report back.