May be rescaled because '1' is arbitrary. In 1959, Stevens recognizes that the invariance rules could allow another scale on the same 'level' as interval. Beyond Ratio Ratio is not the 'highest' level of measurement, '1' need not be arbitrary. Using Stevens' invariance scheme, an 'absolute' scale could not be rescaled by any multipier. Both zero AND one are fixed.
Probability is an absolute scale.
Bayes' Law and other axioms depend on absolute scaling. Just as a difference of intervals is ratio, some divisions of ratios produce absolute measures. Counts are discrete, since only integers can result. There is a real zero, and 2x does mean twice the quantity. Some measures are cyclical, with a fixed range.