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These sieves are widely known for the accuracy of their mesh counts and openings. Sturdy construction of brass with no crevices or other "catch all" traps to retain particles and give false analysis. Use one or more pans with extended rims to make any combination of sieves, providing multiple screen analysis simultaneously. Meets ASTM, NBS, ASA specs and ISO recommendations. All sieves measure 2" H x 8" diameter and weigh 1.75 lbs.