paper clips
beads
finger nails
length of an eraser
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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.+++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.
There are 1,000 millimeters in one meter. So there are 0.001 meters in a millimeter.
Since there is no graph, no information conveyed by the graph and no list of things that may or may not be inferred, the question may well seem pointless to many readers, while to the rest, it must certainly be judged meaningless.
There is no "unit to measure a puppy"; however, there are units to measure specific PROPERTIES which may apply to puppies as well as to other things. Thus, there are units for length, mass, weight, density, albedo, etc.
They may, or may not, be congruent. Congruent means that they have the same measure.