This double-walled calorimeter can be used as is to measure the specific heat of different solids. It can also be used with the included heating element to determine the electrical equivalent. Includes 100x75 mm copper outer vessel , 50x75 mm copper inner vessel, styrofoam liner, plastic insulator ring. The lid has holes to accommodate the heating element, stirrer, and built-in thermometer cork. Removable spring heating element operates on 0 to 6 V DC. *6 V power source and thermometer not included.