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KT 296 A Surface roughness comparator is used to check the smooth finish of a mechanical workpiece by comparison method, eye estimation or a microscope is used to compare and detect the degree of the surface roughness. FEATURES: KT-296A:Note book sample block( turning, vertical milling, plain milling, plain grinding, extermal, grinding, polishing.) Notebook sample block contains standards for the six most important machining methods in the prevalent "AA" values. All 30 Specimens are calibrated in uAA(Arithmetical Average) and in the metric equivalents um Ra. Surface roughness comparison scales following: (Surface roughness comparator KT 296A by TestCoat)