How do you level your turntable?

I use a bubble level to good effect.
I've got a marble slab on top of an inflatable tube. But...
I level the stand first.
Then I put the table on top of the bladder / slab combo.
Then I put the bubble level on the bare platter. I put it at several places along the arc of the tonearm, where the cartridge would read
Then I move the air bladder under the slab a little bit at a time until the bubble level reads level. The slab isn't necessarly level, and the plinth isn't necessarily level. But the platter is.
Every couple of months I add more air and repeat the last step.
Thats just me though.

An excellent bubble level on this site: (http://www.analogueseduction.net/acatalog/index.html?http%3A//www.analogueseduction.net/acatalog/_Turntable_Setup_Tools.html&CatalogBody) Proper leveling(of the platter) is absolutely essential for good reproduction via vinyl.

Bubble level from hardware store - $3.79.

Rodman99999 Yep, both offered here look like winners. Thanks.

I use a bubble level and a Sears digital level that cost about $25. I guess I am as anal as most of the audiophiles here.