Pezikon, I actually agree with you completely. This is one of those areas where I have been advised that I should just enter it into budgets.
However, just to stir things up a bit (not to argue the point - only to solicit some others thoughts) to talk out of both sides of my mouth a little, If you think about it, everything (in this context) has a resolution. I have a Fluke 732A 10 Volt DC source with no display values, no digits, just a pair of terminal really nice Fluke banana binding post terminals.
If I measure this with my Fluke 8508A DMM, there it the 8.5 digits of resolution, repeatability, etc. But, as I think about it, I believe the 732A also has a resolution. It was certified by Fluke and they provided me with a value with a given resolution (can't remember it at the moment). So that is its resolution.
I have some nice standard resistors that I send to a particular standards lab for calibration. They are just analogue resistors. But the certifications provided have the resolution of the measured value, etc. Even the resistance outputs of a Fluke 5700A/5720A calibrator have determined resolutions. The overall uncertainty may be enough larger that it isn't significant. but it is still there.
Even on the DC volts output of a Fluke 5720A calibrator, there is a resolution - the minimum discernment level of its settability, or perhaps the resolution of the certified values from its certificate of calibration.
Just a few thoughts to see others thoughts.