Please clarify what aspect of the can of coke you want to measure: its height, color, albedo, mass, volume, etc.
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Millimetres
Kilometer
metric tons
You would use square metres (m2) to find the area of a door.
There are no tools that are specific to metric system: the same tool can also be used for the Imperial system. The best metric unit of weight of a CD is probably the millinewton.