MicroinchTM; Comparator Plates. Surface Roughness (Texture) Comparison Standards Made of solid Electroformed Nickel. The Largest variety of Standards available for assessing and specifying, by Symbol, the Degree of Roughness. of Machined parts – including every machining method known. every obtainable value. 17 Different Sets available. Each value Size is 16mm x 25mm (or 5/8″ x 1″). Overall dimensions of each plate 25mm x 128mm (or 2-1/16″ x 5″). Light in weight – Can be carried in Pocket. supplied in Plastic wallet. Model No. 16012, Cylindrical Turning Comparator Maching Method: Cylindrical Turning No. of Specimens: 8 Range Ra ?m: 0.4-50 Range AA µ”: 16, 32, 63, 125, 250, 500, 1000, 2000 N Numbers: 5-12 Manufactured to ANSI-B-46.1-1985 Each Set is supplied in rugged vinyl Case which contains a durable instruction card With valuable information in easily understood language. This enables the user to obtain best results when assessing Roughness or Finish by sight and touch. All 18 plates conform to S.A.E. and Mil specs.