The above Rockwell indenter is performance verified against reference indenter using a standardising machine at FMCTL. The standardising machine is directy calibrated as per the requirements of ISO 6508-3:2015 and ASTM E18-16 annex A2. The standardising machine is calibrated using devices traceable to NPL-India, NPL- UK, IMGC, NIST or PTB either directly or through NABL, UKAS, NVALP or DAkkS accredited laboratories.