Spec's for a Accurite 12x18 Granite surface plate

[Crayonman]

Does anyone have Specifications for this Surface plate?  I'm normally an RF guy who is a fish out of water at the moment.   I am trying to develop an in house cal procedure for some spirit levels that a customer of mine bought.   any help in that problem would be great too.  Thanks in advance!

[ck454ss]

Depends on the Grade.  Refer to Fed Spec GGG-P-463c for tolerances.

[Crayonman]

thank you