I have many more expensive rulers but don't need their accuracy. This set of 12, 8 and 6 inch rulers was fine for my use. Keep in mind that they have not been cut cleanly and the edges are slightly sharp. I assume they were clipped +/- 0.015 inches from the true end of the printed scale. Sufficient for most applications. Also remember that the ends are not necessarily cut square. They get a fourth star just because they are so cheap.
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