I've been buying the cheapies off Ebay. I got a couple which drifted badly and now have two that are really good and have little to no drift during a session.
Here's one I've used with good success for checking handgun powder loads as dropped by the measure. It doesn't work for my rifle loading because it seems to not recognize the trickle charging unless I use a finger to "bump" the powder dish. But for checking the weight of powder dropped from a measure it's just fine. Nice big numbers and ir remembers the units mode that was used last. So no cycling through to get to "grains" each time. It's become my general checking scale for most reloading use. It's also excellent for weighing bullets if that's your thing. It settles quite quickly.
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For my rifle loading I went with a 0-30 gm scale and lucked out with a model on my first try that stays "active" so trickle charging to bring to weight is excellent. It is also quite stable for zero over a 10 minute period on average. If I notice anything sooner it's typically a grain of powder that got spilled onto the small dish which I use as a rest for the bigger powder dish. And with a resolution of just plus or minus .01 grain (that's right .01grain, not gram) I can really zero in on an accurate weight load for my accuracy rifle loading. In practice it's so fussy that I am happy when it's within .03gn of what I want.
This is the one I'm using;
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Why am I suggesting these cheapies among all the offering given so far that range up to well over $200? Only because I and you can buy a lot of duds and finally find a good cheap one that works as well as the expensive ones for a heap less money.
If I were running a lab and needed an accurately calibrated scale it might be another thing. But if I can measure CONSISTENT loads that are within a small error from calibrated I'm just fine with that. And besides. trusting them to a true weight standard is just a calibrated test weight away.