The Density Laboratory realizes the derived unit of Density through two high quality polished single crystal Si sphere artefacts of mass ca. 1 kg traceable to the German National Standards of Mass and Length (PTB).
Dissemination of the unit of Density to liquids and solids is accomplished by hydrostatic weighing in the ranges 600 - 2000 kg/m³ and 7700 - 8400 kg/m³ respectively, with relative uncertainty to 10 ppm.

The Laboratory performs density calibrations of:

1 mg-1kg weight standards
Range 7700 - 8400 kg/m³
Relative Uncertainty 10 ppm

2 kg-20kg weight standards
Range 7800 - 8300 kg/m³
Relative Uncertainty 0,06%

digital density meters
Range 600 - 2000 kg/m³
Relative Uncertainty <0,01%

hydrometers
Range 600 - 1300 kg/m³
Relative Uncertainty <0,10%