The ratio level of measurement has

The ratio level of measurement has a true or absolute zero point that marks the complete absence of the attribute.

Because of this real zero, statements about ratios such as twice as much become meaningful.

A constant odd number is not a property of any measurement scale.

Unique applications is too vague to be a defining feature of the ratio level.

Limited use in physical sciences is false, since the physical sciences rely heavily on ratio measures.

Height, weight, income and reaction time are common examples of ratio level variables.