Adjusting a machinists level?

[RJSakowski]

SO what’s the point in buying a high quality machinist level? Is there any point?

There are two things which distinguish a machinists level from the garden variety level. The first is the sensitivity and the second is that the base is very very flat.

A typical carpenter's or mason's level has a sensitivity of .1"/10" whereas a Starrett series 98 has a sensitivity of .005"/12 " or 240 times better. The Starrett 199 series has a sensitivity of .0005"/12" or 2400 times better.