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depends on what item you are measuring
Probably no individual item. But the combined length of all the fibres in carpets, or all the yarn in clothes, all the strands of wires in cables would measure kilometres.
A carat is used to measure mass, the amount of matter an item contains, and is used to measure gemstones. A metric carat is equal to 200mg.
it indicates the ending.
To measure the mm of an item you would need to use a metric ruler. The metric ruler has cm and mm on it.