Description
157-103 Mitutoyo Optical Parallel: 12.25mm
The Mitutoyo 157-103 optical parallel has the following specifications:
Thickness: 12.25mm
Range of Micrometer to be Checked: 0-25mm
Diameter: 30mm
Features:
Designed to inspect parallelism and flatness of measuring faces of micrometers
Available in Metric or Inch
Parallels are offered as individuals or as a set
Each set of parallels consists of 4 thicknesses
Constructed of highly polished, lapped optical-grade glass
Inspects the flatness of metal, ceramic and other materials
Supplied in a fitted wooden case
The Mitutoyo 157-103 optical parallel is constructed of optical-grade glass and can measure the parallelism and flatness of a micrometer’s measuring face. When used with a monochromatic light, a Mitutoyo optical parallel can determine the measuring surface parallelism within 0.2µm/.000008” and flatness within 0.1µm/.000004” on micrometers. Our optical parallels are precision polished and lapped for exceptional flatness in our Japanese factories.
Technical Data
Flatness: 0.1µm
Parallelism: 0.2µm
Parallelism check between measuring faces by means of interference fringe produced by an optical parallel.


