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A rulerDepending on the degree of accuracy required: a ruler, vernier callipers, micrometer.
Micrometer to measure the accuracy of 0.01 mm. Caliper to measure with accuracy of 0.1 mm is used.
accuracy is when you KNOW something and uncertancy is when your not sure
It is the accuracy in the estimate of the constant or the effect of rounding.
Vernier calipers are used to measure length when quite accurate measurement is required, but not such accuracy as to require a micrometer.