Great way to calibrate turntable platter speed – PlatterSpeed - Vinyl Tool Review

I used this to trim the 33 and 45 RPM speeds on my Clearaudio Ovation turntable, using the Analogue Productions Ultimate Test LP as a source for the test tone. Works brilliantly, and cheaper than buying a strobe disk and light.
Review by RaceTripper on PlatterSpeed - Vinyl Tool.