Netfabb provides ways to measure lengths, distances, thicknesses, and angles on and between parts. Feature detection and snapping helps with setting measurement points.
Multiple measurements can be created which will be maintained and updated as much as possible (or sensible) during further steps such as (proportional) scaling, moving, and rotating, as well as Undo and Redo actions, as long as the original part is kept.
Measurement is provided as a module. However, it is also available in selected other modes. Look for the
New Measurement button in the toolbar.