21-801-6 SPI Portable Surface Roughness TesterSPI Portable Surface Roughness Tester The new SPI Portable Surface Roughness Tester can be used for many applications by selecting from a variety of optional accessories. Features include Convenient and accurate way to obtain surface finish on a variety of workpieces including flat, inside and outside diameters. Measuring grooves and recessions: wider than 0. 16" (4mm) Equipped to measure Ra, Rz, Rq (Rms), Rt, Rs, Rsm, Rmax, Rpc, Rmr Conforms to ISO,
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