one side only while others are marked on both sides. If marked on both sides, the markings can be identical or can have imperial units on one side and metric on the other.

Reading a rod

In the photograph on the right, both a metric (left) and imperial (right) levelling rod are seen. This is a two-sided aluminum rod, coated white with markings in contrasting colours. The imperial side has a bright yellow background.

The metric rod has major numbered graduations in meters and tenths of meters (e.g. 18 is 1.8 m - there is

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