Mitutoyo 158-122 Series 158 Optical Flat, Inch, Diameter 1.8" mm, Thickness 0.5"

The Mitutoyo optical parallel is made of optical-grade glass and is used to measure the parallelism and flatness of a micrometer's measuring face.

Features:

• Constructed from highly polished, lapped optical-grade glass
• Used to inspect the flatness of metal, ceramic, and other materials
• Supplied in a fitted wooden case