Heavily insulated stainless steel cabinet with three-layer refractory top provides excellent heat retention. The microprocessor temperature control keeps 2°F (1°C) stability. Determine the carbon residue of your sample which provides an indication of the deposit-forming tendencies of fuels. Simply insert up to five samples, the furnace quickly reaches the test temperature of 1022°F (550°C). Apparatus features digital temperature setting, over temperature control, ceramic band heater with cast iron block, and heavily insulated stainless steel cabinet.