Any length can be measured in millimetres, although it would be silly to measure the distance to the moon in millimetres!
The lengths of insects, leaves may be measured in mm. But mm are also used, for accuracy, in measuring up units for fitted kitchens, wardrobes and so on.
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The preferred units in SI are the metre and millimetre. The centimetre is often used in shopping, clothes sizes and the like, but other than the cubic centimetre (cc) used in chemistry, not in science and engineering.
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your finger nail can be measured in millimeters
Lengths that are more than 1,000 microns and less than 1 meter are usually measured in millimeters.
they are measured in centimeters.
Any object can be measured in millimeters-- here are 6 objects.a computeran airplanea pair of scissorsa fingernailan iPoda leaf
precision engineerting, e.g. piston ring size in car engines.