Checking speed 331/3, 45

A Strobe Disc, The Vinyl Engine has a free download of the disc
with instructions of how to use it! Extreme Phono.com also has a
free one!

Do you have any Android phone?
If so you can use the free Strobily strobe app.
Download a strobe suitable your TT's main frequency from Vinyl Engine then print and cut it round.Put it on your TT over a LP and trim your speed under phones flashing light also at the same time playing the outer parts of LP to compensate stylus drag.

It could help if we knew your TT.

Good Luck,

PS:I am sure there are also apps for iPhones, so search if you have one.

Thanks for your replies! I have downloaded an app for my iPhone and it works great- thanks again.
ATB,
Mark

Another option to consider: Feickert' PlatterSpeed app, which
can be downloaded to a cell phone or E-reader from
"platterspeed.com". It's easy to use, works very well, and is
very accurate. It will require having a test record with a
3150 Hz signal. Feickert has a small test disk -- called
"Adjust+" I think -- that you can buy to use with
the app, but it's inexpensive. Using this app and disk, I was
able to dial-in my turntable's speed to +/- 0.2 Hz of 3150.
(I have a VPI Classic 3 with SDS).