The furnace provides a cost-effective method for the accurate determination of bitumen content in a bituminous-mix. The maximum weight of sample, which it can handle, is 4000 grams. The temperature range, in which it operates, varies from 200 to 650° C. The accuracy of its internal balance is ±0.1 gram. It has automatic interlock, which cuts power when the door is open. Its chamber dimensions are 355×266×355 mm..