... and accuracy meet the requirements of ISO 6508 and ASTM E110, tested by National Institute of Metrology and the error is ... medium size moulds, shafts, rollers, tubing and all kinds of metal parts.Used for production inspection and acceptance inspection, ... HRB, HRA etc. 15 scalesResolution:0.5HRAccuracy:Meets the requirements of ISO6508Application:All metals, including steel, some cast iron, copper, ...