How do you level your turntable?


Short of buying a 400 dollar digital level, what have you found that really does the trick. I've tried various cheap bubble levels with fair to poor results.
rloggie
1. Level stand
2. Check TT from platter and base
3. Sit back and enjoy, and do not check again unless I need to
I used several long levels (two 4' and one 2') to check the accuracy of three 12" ones. (One of those was actually out a little.) The accurate ones are used to level the platter. Once that is done, I permanently mount a pair of custom made glass vials into the plinths of my turntables, so the user can keep an eye on it all along. To me, levelness is a big deal.
Great input really got me thinking. I had forgotten that the spindle of my turntable is removable. With it out I was able to put the bullseye bubble level directly in the center of the platter. That gave me a reasonably good reading. Guess I'm headed to Sears now.
I use a cheap, 1" long bubble level (not a round one, which would be pretty useless).

To compensate for the inaccuracies of a bubble level, if any, all you have to do is spin it 180 degrees and re-check on the same axis. If the results differ, halve the difference and you're level. Nothing could be simpler.