Superior quality double wall calorimeter with easily removable spring heating element unit. The Calorimeter operates on 3-6 Volts DC and approx. 5 watts. It consists of inner aluminium reservoir 150ml capacity aluminium outer plastic insulator ring and Styrofoam lining to minimize heat loss. The lid accepts the heating element stirrer and thermometer cork includes cover cap.An external power supply is required (B8G85458 or similar).