| Surface Roughness Stand Comparator Standards Composite Set Description: *As standardized in ISO2632/1-1975 *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 esimation or magnifying glass. The surface rough contrast blocks is made of 45 carbor stool except the GCr15 which is using to plat lapping the sample block. *All 30 speciments are calibrated in u ''AA(Arithmetical average) and in the metric equivallents um Ra. *Classify and rough degree parameter as table. 
Notice of operation and maintence: When working the surface rough contrat block should be as possibile as under the same with the checked workpiece(Including surfacecolour, illumination etc) and it is forbidden to contact the surface rough contrast block direct by hand. Antirust treatment should be strictly followed to avoid corrosion and strike and scrape should be avoided. 
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