non SI-conforming unit of mass which comes from the Anglo-American Troy or Apothecaries' Weight System of units according to NIST of 1 pwt = 1.555174 10^3 kg
non SI-conforming unit of mass which comes from the Anglo-American Troy or Apothecaries' Weight System of units according to NIST of 1 pwt = 1.555174 10^3 kg