The compacting factor is the ratio between the weight of the partially compacted concrete and the weight of the fully compacted concrete.  
The apparatus is designed to perform the test in a more precise and accurate way.
Consists of two conical hoppers attached on a cylinder, and everything is fixed on a robust steel frame.
Each hopper is equipped with a hinge for a Quick Release mechanism.
Dimensions: 500x400x1510 mm
Weight: 55 kg
Supplied complete with tamping rod dia. mm 16×600 long.