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Comparators for visual roughness comparison/reference Microsurf
This range of light-weight comparators is more suited to office and design shop use to give to the designers a visual reference for surface states in various conditions of machining. Each block includes patches finished or machined following the procedure indicated on the surrounding label. The value of roughness data in Ra complies with ISO 2632 and BS 2634.
Those comparators should be only used for a visual comparison and are not intended to serve as a reference surface to calibrate the roughness gauges.