Micrometer Size: 0-1"
157-109 Mitutoyo Optical Parallel: .5000"
The Mitutoyo 157-109 optical parallel has the following specifications:
Parallelism check between measuring faces by means of interference fringe produced by an optical parallel.
The parallelism between the measuring faces can be determined as follows:
Mitutoyo Individual Optical Parallels and Optical Parallel Sets: