Quote Originally Posted by morrisman View Post
I actually took the plunge and bought a British 'Rabone' brand machinist level on ebay .... don't know if its going to be of much use as its a 6" version. I see most of you guys use the longer types , either 8" or 12 " . Is a 6" level any good ? Mike
Hi Mike,

6" is fine, it's sensitivity that's the important factor, if you want a quality level, i'd be looking at a Wyler like one of these, Swiss Quality Discount

As far as calibration goes, most of the time you'll only use the level at one point, that is close to zero ( perfectly level), linearity at points away from zero is hard to measure unless you have a pretty good metrology setup.

Regards
Ray