Described as 43 x 36 x 84 cm. (with guard). Gray metal box, which is mounted stirrup with two plastic discs which are connected to the apparatus itself and a type of ticket. Belongs to the unit also has two lines with the valve and nozzle, as well as a graphic records. Used for spirometry and helium dilution lung volume testing. From the Steno Museets Samlinger (A museum in Denmark) website, item #156635.