Jim Kelley wrote:
You'd have to be able to demonstrate that relativistic effects single
out particular units of measurement to the exclusion of others without
having an effect on the observed phenomena and all within the same
reference frame before being able to substantiate any claim that the
result of a particular measurement is arbitrary. Can you demonstrate that?

Relativistic effects certainly single out measurements
of time - also length in the direction of velocity.

It has been demonstrated numerous times that the velocity
of a clock affects the length of its second. What is
the velocity of the cesium clock on Earth?
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73, Cecil http://www.w5dxp.com