استاندارد: ,ASTM D4791,EN 933-4,EN 933-5,EN 933-7,ISIRI 11269

Use to determine the percentage of flat particles, elongated particles, or both flat & elongated particles in coarse aggregates.  Ratio desired is obtained by selecting one of four adjustable positions: 2 = l:2; 3 = 1:3; 4 = 1:4; or 5 = 1:5.