Imho & fwiw,
Firstly the Sartorius Entris is an Analytical Balance whereas the AND FX-120I is a precision balance by definition. Simply the Sartorius(Made in Germany) measures to .0001 grams and to .002 grains whereas the AND FX-120I(Made in South Korea) is a Precision Balance and is designed to weight to .001 grams and .01 grains. A difference in RESOLUTION. The Sartorius, to my mind, has a better draft shield which is has three sliding glass doors while the AND has a plastic enclosure. Personal preference. Further to remove the silliness out of this discussion please realize that AND makes an Analytical Balance that duplicates EVERYTHING that the Sartorius does with .0001 grams resolution, as well as the EXACT breakdown of .002 grains resolution. The bad part is the AND HR120 runs a little over $1860... It ALSO has a very similar looking draft shield arrangement to the Sartorius EntrisIS 64. Nice scale but almost twice as much as the Sartorius for the EXACT level of performance.
AND HR120 Analytical Laboratory Balance
http://scaleman.com/analytical-lab-balance-hr120.html
The beginning and ending of this discussion is how much information do you want before you round off the previous number. I may not need it, however, like many other things once you get used to the increased resolution it would be difficult to go backwards and loose the third digit. It MAY very well be information than I cannot use, however, when you have enough tolerance in any set of measurements that you cut off prematurely it can affect the long term total. It does change the final number. Just a little but it is cumulative. If you don't want it get the FX-120I... Truthfully you can spend FAR MORE MONEY on either an AND or Sartorius scale that will only read to .1 grams. That said it dead accurate to that weight. Moral of the story is choose your desired level of resolution and move on... Fwiw, David Tubb runs the Sartorius Entris 64.
I could personally be happy with either. I started with a friend's AND FX-120 and frankly it was so far ahead of ANYTHING I had ever used before it I was amazed. It was one of those situations where you knew you just cost yourself a bit of coin. I had also run the Sartorius GD-503, however, it only had resolution of .005 grains, which in my mind, was of most modest help. It WAS more information, however, it was not THAT MUCH more information. Had it not been for the over bearing scale salesman(who is not really a bad guy) I would have gone on thinking the Sartorius was .005 grains resolution. The Entris is a relatively new unit, with well tested electronics, keyboard, and force restoration balance. The AND is a hybrid Force Restoration System.
As a side note the RCBS Chargemaster Digital Scale has been discontinued as a separate product. I was talking with RCBS yesterday. It will still be available as part of the CM 1500 combo unit. Why anyone would buy the scale but itself is beyond me. There are FAR better scales on the market at similar pricing.
Just a fwiw, imho, and afaik.
Regards, Matt.