Glastonbury Southern Gage Z Axis Check Master with Lapped/Mirror Finish LX1

Z axis check masters are used to calibrate and set the z axis on optical measuring machines.
The master is superior to gage block calibration because they do not require block stacks and therfore it is much faster to inspect linear range of the machine.
Engraved to the nearest .000010″
Lapped Base with mirror finish