The civilization of the Indus Valley had a well developed measurement system, using weights and measurement scales. The smallest scale from the Bronze Age period was found in the region; made in ivory, it was marked with a division of 1.704 milimiters. They used decimal units for measuring weights also. And although the exact measurements for a weight unit (generally 28 grams) varied from region to region, the scale of 5:2:1 was followed when measuring amounts of said units.