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Some wooden rulers do not start with 0 at the edge, but have it set in a few millimeters. How could this improve the accuracy of the ruler?

Some wooden rulers do not start with 0 at the edge, but have it set in a few millimeters. How could this improve the accuracy of the ruler?
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Some wooden rulers do not start with 0 at the edge, but have it set in a few millimeters. How could this improve the accuracy of the ruler?

User HBR
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It is possible for a wooden ruler to be worn out at the edge. If such a ruler is used for measurement, there will be error in the measurement due to the inaccuracy of the ruler. To avoid this, some rulers do not start with zero at the edge.
User Searke
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