This 250mL Double Wall Electric Calorimeter Kit is made from high quality aluminum. The kit consists of a 250mL aluminum inner vessel, a 900mL outer vessel, and a transparent cover with two terminals. The terminals are cross-drilled at their lower ends and are fitted with a 5 watt heating coil. The upper ends are fitted with standard sockets with electrical connections. The cover contains two holes for a thermometer and stirrer. A stirrer is included. Outer vessel measures 5.125 x 4 inches. Inner vessel measures 4 x 3 inches. The heating coil is easily replaceable.