This accessory to the Digital Absolute Permmeter, Model No. 42105, tests the base permeability of dry sands. It consists of a calibrated metal tube, screen, and compacting weight. The tube is filled and the compacting weight is placed on top of the s and. This assembly is tapped until the compacting weight finishes settling and the sand has achieved its maximum density. Then the weight and top portion of the tube are removed and the excess sand is struck off. The remaining assembly and sand specimen are installed on the Digital Absolute Permmeter, Model No. 42105 and measured to determine the base sands permeability.