With powder measures you are lucky to consistently get +/- 0.2 grains with most extruded powders. And with Varget (that I avoid like the plague), +/- 0.3 is more like it. You don't see this if just checking a few here and there with a balance beam.
But then an additional electronic scale (not necessary unless loading for long range precision), adds it's own issues, especially in areas that have high static electricity like ABQ.
My Gempro electronic scale reads to 0.02 grains, but is it really that accurate? Hence I finally went to -.02 on the low side (it really easy and quick to trickle in a little more) to +.04, on long range loads, and maybe +.06 grains on hunting loads.
Note that an individual kernel of (most) stick powders will usually weigh (roughly) between .02 to .04 grains.
BTW, the Chargemaster only reads to 0.1 grains. I weigh every single charge - just part of my routine. I would say that it's almost never off by more that -.06 on the low side and usually much closer than that. It will occasionally go Over by much more, but it will let you know if it's about +0.1 or more.
I had the Gempro electronic scale and the nifty electric trickler before I ever considered getting a Chargemaster, BTW.