It meaures in centimeters and inches.
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With a "ruler" or "tape measure" calibrated in imperial units
the same as it would be if you measured it with a tape measure as long as you were accurate
In mathematics, two quantities are said to be in units agreement if they have the same units of measure. For example, if two quantities are both measured in meters, then they are in units agreement. If one quantity is measured in meters and the other is measured in centimeters, then they are not in units agreement.
You measure length in many ways: using a ruler or yardstick, using a string or tape measure, using a machine to drive or fly over a distance, or using a satellite. Length is measured in units such as centimeters, meters, kilometers, or inches, yards and miles.
A ruler that can measure very small units.