The units of measurement of ancient Rome were generally consistent and well documented.
Bronze modius measure (4th century AD) with inscription acknowledging Imperial regulation of weights and measures
Roman milestone in modern Austria (AD 201), indicating a distance of 28 Roman miles (~41 km) to Teurnia
A Roman steelyard weight of one dodrans, i.e. 3⁄4 libra
Cubit
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The cubit is an ancient unit of length based on the distance from the elbow to the tip of the middle finger. It was primarily associated with the Sumerians and the Egyptians. The term cubit is found i
Ancient Roman units of measurement
…pedes) (Roman) foot 1 pes 296 mm 0.971 ft sometimes distinguished as the pes monetalis palmipes foot and a palm 1+1⁄4 pedes 370 mm 1.214 ft cubitum cubit 1+1⁄2 pedes 444 mm 1.456 ft gradus pes sestertius step 2+1⁄2 pedes 0.74 m 2.427 ft passus pace 5 pedes 1.48 m 4.854 ft decempeda pertica perch 10 pedes…
Cubit rod of Maya, 52.3 cm long, 1336–1327 BC (Eighteenth Dynasty)
The Nippur cubit-rod in the Archeological Museum of Istanbul, Turkey