Technical Data:
Optical parallels
Check the flatness and parallelism of measuring faces of micrometer
Flatness of A and B: 0.1um
Parallelism between A and B: 0.6um
Applicable micrometer: 50-75mm
Parallels included (b): 65.62mm, 65.75mm, 65.87mm, 66.00mm

Dimensions:
D=40mm