In Blender, there is an embedded add-on measure tools to measure 3D objects with dimension, this is free add-on called Measuirt. As per screenshot showed at the top, we can measure the size of 3D object, for instance, measuring the distance between 2 vertices, the edge length, the angle and the area of surface. The measurement is auto updated when you edit the shape of model. Also, we can add the annotations by using this add-on Measurit. Hope this helps! More Free Blender Tutorial here.
How to measure object in Blender
Below video is a quick demonstration showing how to turn on Measurit add-on in Blender, and how to measure a cube in Blender.
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