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USAF 1951 Resolution Wheel Pattern Microscope Slide NEG Ideal to check resolution across a field of view. This is a 3” X 1” slide with a USAF 1951 Resolving Power Target reproduced 9 (nine) times. Each image includes Group 2, Element 1 (4 lp/mm) through Group 7, Element 6 (228 lp/mm).Polarity Negative: Clear pattern on a dark field.On stable glass substrate etched in reflective chrome. Pattern on top surface. (Right reading looking through.) Click here to download drawing Show more