What are these 12 rulers used for? They don't have standard marks

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What are these 12 rulers used for? They don't have standard marks

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What are these 12 rulers used for? They don't have standard marks except for the inches. The gauge is with 11 or 14 marks per inch or 14 or 18 marks per

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100% Made in USA by PEC Tools Products Engineering Company English / Metric markings with mm and .5 mm one one side and quick-reading 1/32 and 1/64

PEC Tools 12 300 mm English / Metric black chrome, high contrast machinist ruler with markings .5mm, mm 1/32 and 1/64