Do a search on "bald eagle" scales from grizzly supply. They are under $100 and are a crazy nice scale for the money. I bought one after a review by a pretty well known shooter on another site.
This also measures down to .01 grain on the readout....and it trickles up nicely and has been very consistant for me. It knows every granule I drop on the pan.
So I checked my trickling technique on my 1010 scale against the digital.
I found my weakest load vrs my strongest load on the 1010 scale throwing 50 grains of varget was .08 grains different. If you put that on quickload shooting a 3006 it means an extreme spread of 4 fps......thats right.....4 fps or plus or minus 2 fps from the middle of the pack.
I also checked my hornady auto dispenser and found it was within spec. They are supposed to be plus or minus .1 grain...almost everything fell into plus or minus .075 grain and that means an extreme spread of 8 fps....or plus or minus 4 fps from the target load.
So...all things considered it looks like most of these scales are plenty good for MOST OF US.
It would sure seem that internal case capacity, perhaps primer consistancy, flash holes, variances in neck tension and general acts of god are going to come into play more than the scales. But....Im glad I spent the money on the new scale cause I can check the others from time to time.