I have an RCBS 5-10 balance that I bought used in about 1980.
I have an RCBS 5-0-5 balance that I bought around 2014/2015.
I also have an electronic scale branded "Smart Weight" that I bought in 2018 that can display weights in grains.
My 5-10 sat out, uncovered for 20+ years after the sudden, severe onset of my multiple sclerosis. When I returned to it, it was effectively worthless - at least until it was thoroughly (and properly) cleaned.
All three of my balances/scales now agree with one another or only disagree by 1/10 of a grain.
I my case, this is only relevant when I am reloading .25ACP since fractions of one-hundredth of a grain in such a small case can be significant, so for it I always use the electronic scale.
One piece of advice is that if you have an old balance, have it professionally cleaned and restored if you can.