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Surface Quality refers to the cosmetic features of an optical element in terms of visually permissible defects on the element’s surface. The Scratch-Dig specification defines this surface quality. A scratch is any mark or tear and a dig is any pit or divot in the surface. The specification is denoted by the scratch number followed by the dig number; for example, a scratch-dig of 60-40. These values do not actually correspond to a specific number of defects, but rather reflect the quality of an optical surface by means of comparison. This paddle is a visual tool which facilitates this comparison. Developed in response to the need for an accessible, inexpensive product for inspection personnel, it is an excellent reference tool that is easy to use. Each paddle is marked and identified by batch to ensure quality control. Although this tool reflects Scratch and Dig evaluation as defined by the U.S. Military Specification for the Inspection of Optical Components, MIL-PRF-13830B, it is not certified to national or international standards.
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