Everything packed.
Important: Final rendering & lighting setup not included, but object & materials are included.

Two versions of the ruler available. One (solid) without any cut holes through the center. One (as seen in preview render) with holes cut. The latter has a much higher poly count.
Bottom of cut ruler is hollow.

Initial ruler texture from www.printablerulers.net/ then heavily modified to create custom final texture.
Thanks to Andrew Price for PBR Dielectric Nodes.