"Aluminum Construction, consists of a inner calorimeter 2.85 inch(72mm) ht x 2.39 inch(61mm) dia. and an outer vessel 4 inch(100mm) ht x 4.125 inch(115mm) dia. The two are separated by a molded styrofoam insulated separator. The outer vessel has a transparent cover with rubber stopper with hole for thermometer and has a stirrer. Supplied compelete with stirrer, but without thermometer."