Dimensions: 29.5 cm (open), 14.5 cm (folded)
Setting: Naples, MAN; inv. 84/146
Provenance: Pompeii, or Vesuvian region
Date: First century AD
This instrument, made of two small rectangular bars hinged together, constitutes the Roman unit of linear measure: the length corresponds to 29.5 cm, the Roman foot. The subdivisions of the foot are indicated by the incised marks on the faces of the bars.