Originally Posted by
SOuthernFRIED
A bubble is not going to provide any accuracy beyond what the eye can see. Try a 6 inch digital level that will measure to the hundreths at least, then you can see how level your board is. Glass is about the truest surface I have ever found.
The surface has to be flat (glass) and LEVEL (jack screws).
The bubble level is so you can level out the flat surface. It is totally adequate for the purpose. I have a digital level for the camber/caster gauge on my 1:1 car and IMO there is no additional accuracy to be had.
I use a $10 Ikea coffee table in my workroom/spare bedroom, and a left over cabinet door at the track.