Outer Container Material : Aluminium with rolled rim or wooden box. Container Shape: Cubical or cylindrical. Top Cover Type: Removable or sliding. Calorimeter Vessel Material: Aluminium or copper. Vessel Size: 100 mm x 75 mm 75 mm x 50 mm Stirrer Size (Min): 100 mm x 3.5 mm 150 mm x 3.5 mm 75 mm x 3.5 mm.