Blender 2.8 Viewport Ruler (For User Preferences) — Right-Click Select
Ruler 3D Model $5 - .blend .obj .fbx .3ds - Free3D
The Blender user interface | Blender Quick Start Guide
3D Printing Ninja : Free Help Guide to Master 3D Printing: How to Measure in Blender
I MAKE 07 Workshop - osmm.net
Dividebyzer0 on Twitter: "A ruler will help you measure distance when placed on top of the paper map. #TUNGUSKA #devlog #blender #MadeWithUnreal #UnrealEngine #UE4 #indiegame #gamedev https://t.co/3CVCgi0D0X" / Twitter
How to accurately measure in Blender - Artisticrender.com