One of length.
I'd go for Metres and Centimetres but you could use Feet and/or Yards.
Or declare a new unit of "Flagpole" which is exactly one flagpole long....
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The unit of measurement that would be best for measuring the distance from the North Pole to the equator is kilometers (km) or nautical miles (nmi). These units are commonly used to measure long distances and are suitable for measuring the Earth's surface.
cm
Centimetres.
Grams
UV