The trick/problem with PDFs is the scaling at the printer. I have sometimes placed a ruler over the template when I scale it, and then people can check the correct measurement/scale of the printout.
You can sometimes set preferences of your PDF software: original size or full size. The preferences/settings in software are different depending on the generation of your PDF software and the generation of your PC's OS.
There is a 3/4" hole on that template. Print it out and measure the hole diameter on the template
