Diffusion cell apparatus having 3, 6 & 8 stages (stirring units) here user can place any no of cell up to it own capacity, instruments will provided with hot water circulating system to maintain uniform desired temperature having temperature accuracy 0.1 degree c. In each and every diffusion cell ( glass part) as receptor cell, in addition to we provide separate controller for each stirring unit, means user can stirrer each and every stirrer by different rpm.With digital rpm display. 24 inch x 36 inch x 36 inch