Size Estimates of Our Solar System Ruler

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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 re lative 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. Show more