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foot is the most precise way to measure any unit
None. Feet are an outdated unit of measurement and so could never be the most appropriate.
126dm is a smaller unit and denotes a higher degree of precision.
No, a pencil is not a unit of measurement.
A spherometer is an instrument for the precise measurement of the radius of a sphere. The spherometer directly measures a sagittal. Since the spherometer is essentially a type of micrometer, it measures very small things like millimeters.