NewPlex  Suggested by speters33w 

This is standard lettering for phenolic labels, used everywhere for industrial applications.

Some codes (IFSC, etc.) specify "Arial or similar font (Non-Bold)." (This font is not Arial.)

It is the font called "Normal" in this sample:

http://plastic-tags.com.s167304.gridserver.com/pdfs/font-eng2.pdf

Informative answer
The pdf document contains vector paths taken from the instructions for routing machines.
The vector paths can be made into computer fonts by importing them into a program like Fontlab and giving them width by using a parallel line technique.
Unfortunately, it takes some skill and experience to make a matching computer font from a no-width vector path
Perhaps somebody has already done this for "NORMAL"

Hey, Don,

I looked for embedded fonts in that sample, too.

But when you found no width vectors that made me think: "Maybe it's an AutoCAD font."

It is called NewPlex.

Based on the Run-Of-The-Mill Simplex.

You can get most AutoDesk fonts by installing a demo of AutoCAD, though licensing will be tricky if using for commercial purposes without buying product.

http://www.autodesk.com/products/autocad/free-trial

[EDIT Dagnabbit, took another look, the 3 is not correct for it to be NewPlex. I'm still sure it's a standard CAD font, based on Hershey Vectors, see http://paulbourke.net/dataformats/hershey/ which has the correct 3.]

No, New Plex's "3" and "C" does not match.

EDITED:
Even if we find a matching .SHX font, converting it to an otf/ttf/pfb is not a walk in the park.
The fonts in the pdf seem to have been converted from .SHX to .eps, which is a format easy to extract with Illustrator and copy to Fontlab for editing.

@speters33w:
I looked at the Hershey Fonts but they have me stumped.
They have no extension in the download to suggest what format they might have.
There is a download for PC with a .fnt extension but the fonts are unrecognized as valid fnt files by FontForge and by online converters such as http://www.files-conversion.com/font/fnt

Might do better to find a substitute among the various Leroy Lettering or DIN fonts that are available in otf/ttf/pfb