The minimum length that a caliper can measure is 0.1 mm. While the minimum length that a micrometer can measure is 0.01 mm. permission; The most commonly used instrument for measuring length is the micrometer.
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The perimeter of 1 sq meter is 4 meters, which is 4 times the length of 1 meter. However, squared lengths (sq meter, sq foot) are not measurements of length, they are measurements of area. The shortest distance to cross 1 sq meter is the same as 1 meter, and the shortest distance to cover 1 sq meter is the length it takes to displace the perimeter.
unit for measuring length
ruler, meter stick, yard stick.
the ruler The meter stick