Digital Surface Roughness Calibration Block Multi-Engraved Lines Square Wave with RA 1.6μm for KR220 KR110 Digital Surface Roughness Gauge GB/T19067 ISO5436 Standards
Made by optical glass, with high hardness, high accuracy standard roughness value, anti-scratch, has longer life than metal roughness block. Meet standard GB/T19067.1-2003 and ISO5436-1:2000 Approximation: Ra=1.6um Customized Value and Square Wave