The metric system of the unit of measure. Units of measure in the same unit class, such as liters and gallon, can belong ...

The metric system of the unit of measure. Units of measure in the same unit class, such as liters and gallon, can belong to different metric systems. The following values are available: None (units of measure that do not belong to the metric or the US typical system of units; examples of units of measure that use the None category are Box and Pieces), Metric units (the international system of measurement), and United States customary units (the most commonly used system of measurement in the United States).
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