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There doesn't exist such a thing. What does exist are standardized variables, which are variables with mean = 0 and standard deviation = 1
This value is variable and different for each type of measurement. The error can be absolute or relative. A measurement without any error doesn't exist.
Causation, correlation...
the perception of a relationship between two variables that does not actually exist.
That is the benefit of the International SI units of measurement, being base 10 one can convert to a measurement appropriate to what you are doing by simply multiplying or dividing by 10 - thus while the standard measurement is the meter, kilometers, decimeters and centimeters are all the SAME thing just expressed as a different magnitude