by dividing diameter by 2 :)
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Accurate linear measurement.
A rulerDepending on the degree of accuracy required: a ruler, vernier callipers, micrometer.
Vernier callipers are made in various sizes. The range would depend on the size. The most usual size is 0 - 150 mm
It depends on what you are trying to measure. If you are measuring the length of a car, for example, any reading obtained using vernier callipers is likely to be totally useless. The key is to select a tool that is appropriate to the task.
The answer depends on the size of the cube: it could be a micrometre, vernier callipers, a ruler, a tape measure.