Internal-External Adjustable Setting Master, 42-48"
A platen on each head locates the diameter gage from its feet
All contact and working surfaces are hardened and ground
Both heads can be reversed for I.D. or O.D. settings
Each master has a fixed single point rest and two leveling screws which provide a three-point suspension
The position of the gage contacts is matched by the anvils on the masters which are vertically adjustable
The reference head anvil has a fine adjustment for final settings, plus a restrictor to help position the gage in the master