This calorimeter consists of two nested aluminum cans separated by a 1.7cm thick styrofoam liner and a clear molded plastic lid with a filler cap. A plastic insulator ring protects the styrofoam insulation against damage and liquid spills. The inner reservoir has a capacity of 150ml. A thermometer stopper and an insulated stirrer are included. Includes activity guide. Shipping weight: 0.5 Lbs., Dimensions: 7" x 4" x 4".