Used to determine the particle size of Portland cement, limes and similar powders expressed in terms of their specific surface. It consists of a stainless steel cell, perforated disc and plunger. An U-tube glass manometer is fit to the steel stand. The set is supplied complete with rubber aspirator and pack of filter paper. Two versions available: EN and ASTM/AASHTO which differ one to the other for the cell and plunger dimensions which are slightly different.