Convert from douzieme [print] to span

Unit Definition (douzieme [print])
The douzième is a traditional unit of distance used in watchmaking. The word is French for "twelfth," and a douzième is equal to 1/12 Swiss ligne, about 188 micrometers (microns) or 7.4 mils.

Unit Definition (span)
Span is the width of a human hand, from the tip of the thumb to the tip of the pinky finger.