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About these units
Mil (mil)
A mil is an imperial-derived engineering unit equal to one-thousandth of an inch. It is used extensively in manufacturing, machining, and electrical engineering. Printed circuit board (PCB) trace widths, for instance, are often measured in mils because the unit provides a convenient scale for precision without resorting to decimals in inches. Because 1 mil equals 25.4 micrometers, it occupies a scale appropriate for tolerances in industrial production, coatings, film thickness, and gaskets. The mil is especially common in the United States, where certain engineering standards still rely on the imperial system. It provides an intuitive small-scale measurement for technicians accustomed to inches, helping avoid errors that might result from metric conversions.
Reed (reed)
The reed is a smaller unit than the long reed, typically about 1 cubit, and was widely used in Mesopotamia, Egypt, and biblical times. It functioned as a standard measure for construction, religious architecture, and land surveys. Reeds were particularly useful in field work, where repetitive human-scale measurements could be performed quickly. They also served as a practical calibration tool for larger units like rods, chains, and long reeds. The reed is frequently mentioned in ancient texts, highlighting its role in the organization of public works, the construction of sacred buildings, and the measurement of land.