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2the 911mpexpm120 3 in 1 agate mortar and pestle holds multiple head to allow grinding of 1 2 or 3 samples are the same time. the laboratory automatic mortar and pestle provides efficient uniform grinding and its transparent cover permits closed grinding. the mortars diameter is 120mm and rotates at 9 rpm. the pestle runs at 220 rpm. the master motor can be either 220 volts or 380..