Comparison standard according to ISO 8503 part1 and ASTM D 4417Method A, made of Quality steel.Indicates the surface condition of blasted steel according to ISO 8503 in grades of fine , medium, and coarse. The Surface Roughness Comparator allows quick and easy identification of thevarious grades.The two high purity nickel reference plates are subdivided into four sections, each containing a different electroformed profile, copied from a certified mild steel master.
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