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Air Permeability Apparatus is ISI marked and is of variable flow type. It is used to calculate the standard setting times and normal consistency. The apparatus is fitted with a dashpot, which is helpful in facilitating the smooth and gentle lowering of needle. The main purpose of Air Permeability Apparatus is for calculating the fineness of cement on the parameters of definitive surface expressed as the overall surface area in sq. cm. per gram of cement.