Made of heat resistant, low expansion, 3.3 borosilicate glass (upper grade). The sample is boiled in the boiling flask, steam rises in the assembly up to a condenser, and the condensate falls into the small extractor burette (water is returned to the tank through a channel whose position differs according to the densitiy of the oil in relation to water). After some time, the oil volume collected in the burette can be directly measured. Includes 1000 ml round bottom flask (24/29), 300 mm Liebig condenser (24/29) and 10 ml extractor with 0 – 10 ml graduation and 0,1 ml subdivisions (24/29)