Mitutoyo 157-903 Optical Parallels, 0-25mm

Features:

• 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

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. Optical parallels are precision polished and lapped for exceptional flatness in Japanese factories.