I would rather put my faith in a lava lamp :o)
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This methold could cost you nothing and is very accurate. You'll need two pieces of tape (use a type that leaves no residue) and a stop watch/timer. Place one piece of tape on the platter and the other on the plinth. Place a record on the platter, start the turntable and use the tape markers to count the platter's rotation. In 3 minutes you should count exactly 100 revolutions. For even greater accuracy count for 6 or 9 minutes, or even longer. It's tedious, but it works.
David, for almost no cost find an LP with speed bars. The M&K Realtime Direct to Disc and many audio "test" discs have this imprinted on the record label. A small neon night light from Radio Shack works perfectly as a strobe source.
I used this at a friends house recently and when I went back to verify with my KAB, the speed was perfect.