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: 25-50mm
Parallels included (b): 40.62mm, 40.75mm, 40.87mm, 41.00mm

Dimensions:
D=30mm