I see OP already ordered a beam scale. But still wanted to give my 2 cents. I bought a Lyman's XP 1500 for $149. I thought it was great, especially with the mounted trickler over the pan. Ends up it started displaying different measurements when I would lift the pan off of the scale. Say the pan weighs 113.9 G, I would lift pan off and it would read -113.9 - okay good, next time it would be -114.4G, next time -113.3, etc.
Bought some check weights, and display would range from dead-on to .5G high to .5G low. That's on check weights from 1G to 20G. I am loading target loads for handguns, 0.5 G to 1.0 G error just don't cut it. I sent it back to Lyman and they said after its warmup period, it was fine. I wiped it down with Windex as they suggested, and moved it to a "Safe" room, no phones, regular lightsbulbs etc. I even put it in a microwave oven (unplugged) to see if it would shield the scale from any RF interference. Nope - its just a random number generator.
I threw out 6 months of reloading data testing, because of that scale.
I found a Ohaus 10-10 at a gunshow for a good price. Its the weigh to go.