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Elcometer Surface Comparator: ASTM D4417 Method A In Summary, this test method requires that the appropriate comparator is selected and compared with the surface by sight - with or without magnification, or touch. The closest match to the actual surface indicates the surface roughness. Comparisons should be made at an agreed series of locations, which characterise the surface. All the Elcometer comparators can be used in this way.
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