30 Specimens Surface Roughness Comparator Surface Roughness Standard Set with Ra0.05-12.5um ISO2632/I-1975 Standard

specifications Quantity: 30pcs Ra value: 0.05-12.5mm usage：Compare and Determine the Degree of the Surface Finish

• This set contains standards for the six most important maching methods in the prevalent "AA" values.
• These Surface Roughness is used to compare and determine the degree of the surface finish by comparision method and eye estimation or magnifying glass.
• The surface rough contrast blocks is made of 45 super carbor steel except the GCr 15 which is using to plat lapping the sample block.
• All 30 speciments are calibrated in u" AA( ArithmeticalAverage)and in the metric equivalents um Ra.