Vacuum Pyknometer is used to determine the theoretical maximum specific gravity and density of noncompacted bituminous mixtures. Vacuum Penetrometer is used together with Sieve Shaker, Vacuum Pump and Vacuum Gauge to complete the test set. Percent air voids in compacted bituminous mixtures and the amount of bitumen absorbed by the aggregates can also be calculated with the test set. Vacuum Pyknometer is manufactured from transparent plastic and supplied complete with water trap and rubber tube.