These rulers are designed to be read along the top edge, which always has it's zero at the left hand corner. Depending on the orientation of the ruler, it can be read using either metric or shaku markings. Shinwa's beautiful matte hard chrome finish applied for excellent readibility on all increments, and significant numbers are picked out in red.
The 15cm ruler includes half-bu markings in the first sun, and the 30cm ruler includes half-bu markings in the first three sun.
These rulers can be used with Shinwa's excellent ruler stops to achieve repeatable and accurate measurements. Picking up a ruler and a stop together above represents a saving over buying each separately.