What I do with the gempro:
Turn on 1 hour before
zero the scale and pan.
quickly take the pan, dump a charge, place back (dump low, like -.5-.1)
Then, trickle approx, then use your left finger to gently push down on the scale next to the pan to "reset" the measurement to the new trickled weight. Then trickle with right hand, then just gently press with left finger to reset measurement (by that I mean, press too much, then release, so the machine re-reads the weight and does not drift and sees the trickled grains.
every time you drop a few kernels, use left finger to just push on plate to get another reading.
With the right hand you trickle and left hand pushes.
Doing that I can do it in less time than the chargemaster to +- .02 reliably with no drift.
Usually less than 10 seconds of trickling will get you to +-.02 grains.
Often the lee measure drop is spot on.
I have a small bowl with tweezers and will remove or add a kernel. H9845 kernels are approx .02 grains so it's usually +-1 kernel.<
It takes approx 15 seconds for a dump and trickle to +-.02, so I didn't see a need for the chargemaster anymore. It took longer to get me to +-.1
If you take too much time, or if you don't do the rpessing with the finger trick, it doesnt work fine and will drift.
Of course the 750$ fx120i scale will work better, but is it 500$ better? You decide. Not for me.