Eneroth Scaled Tape Measure
Measure model with respect to customs scale. This can be useful when building a physical scale model based on a full size digital model. I prefer keeping all my digital models, even those of a planned physical model, "full size" as it allows Copy/Paste in Place and prevents some clipping and precision issues.
Activated from Extensions > Eneroth Scaled Tape Measure.
Source code available at GitHub.