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.
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No, a pencil is not a unit of measurement.
The smaller the unit the more accurate the measurement will be.
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By unit of length and distance and conversion ,we can say that meter is a a standard unit of measurement
Gradeability measurement unit is %