Optical Flats:

Optical flats or test plates are polished surfaces that are used as references against the flatness of unknown surfaces for comparison. They use the property of interference to measure the flatness of a test surface.
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Product Name Notes
Optical Flats Lapmaster Optical Flats are manufactured using the finest quality materials and the latest manufacturing techniques. The optical flats are made from the highest quality clear fused quartz, which is known...