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ROLYN Optical Flats are now available with certifications of 1/10 wave length accuracies (.000002"). These are made of special fused silica with ground edges with slight safety chamfer and with the second surfaces pitch polished for better visual inspection of the patterns created when in contact with other surfaces. These flats are used in determining surface qualities in optical shops, instrument fabrication, machine and experimental shops, for laser usage and a multitude of other applications. A must for inspecting and checking your "Jo" blocks.
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