The front of the ruler is engraved with information on the unit used in measuring distances in our solar system.

On the back of the ruler a logarithmic scale is engraved with the relative distances of some of the objects in our solar system.

The rules has inch and centimeter scales (and a logarithmic scale on the back)
It is 30 cm (12 inches) long and 3 cm (1.2 inches) wide.
The ruler is made from 3mm high quality Baltic Birch.

This is an unique gift. Ideal for teachers or students or someone that want to measure something really really big.