At that time, the mass unit for the fundo (counterweight) was called 'ryo' but it was also the unit for oval gold coins so, to avoid any confusion, the 'ryo' unit was not used in weighing Chogin.
なお、当時用いられた分銅の質量単位は「両」であったが、小判の通貨単位との混同を避けるため「両」は用いられなかった。