Measures for SAR and Miller Numbers! This test instrument is used to develop data to determine the relative abrasivity of slurries (Miller Number). It can also be used to evaluate the wear resistance of different materials using a standard abrasive slurry media (SAR Number). Meets requirements of ASTM G75. Originally used to evaluate slurry abrasion of materials passing through fluid handling pipelines. Today it is used for many other applications involving slurry abrasive wear.