| http://www.w3.org/ns/prov#value | - Angular displacement measuring instruments having an angular position deviation equal to or less (better) than 0.00025??;Note:1-2.B.6.b.2. does not apply to optical instruments, such as autocollimators, using collimated light (e.g., laser light) to detect angular displacement of a mirror.Equipment for measuring surface roughness (including surface defects) by measuring optical scatter as a funct
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