MeasureIt

It takes some time to get used to the MeasureIt workflow but once you understand it you get everything it promises to deliver. Excellent work!

I have been using this add-on for years. Very flexible and versatile. Was disappointed that it is not included in Blender 4.2, but adding it was easy.

Simple but powerful, includes many settings and additional features.

Tools for measuring objects undersells this addon. It produces renderable dimensions for line segments and area's. Not as intuitive as it could be but works very well.