Standard issue tape measurement tool, which you can adjust the length on by pulling on the arrows to fit your need in the .blend file.
Includes STL, OBJ, MTL, FBX and .blend both high and low poly version.
BLEND (Blender, filesize: 62.6 MB), BLEND (Blender, filesize: 62.6 MB), OBJ (OBJ, filesize: 62.6 MB), FBX (Autodesk FBX, filesize: 62.6 MB), PNG (PNG, filesize: 31.3 MB), STL (Stereolithography, filesize: 62.6 MB)