Bought same scale ~2 years ago. At the time it cost ~15USD. There were like 5 models with 100g/1mg resolution on Ali for that price range. Did extensive research and already then there were reviews for other models that they are rounding. Choose this hoping it will not, but to no avail.
But the scale in general is not good, or I would like it to be better. I have 500g/0.01g resolution scale from 5 years back or so, and that looks very good with like 0.02g repeatability. I sort of expected the same from the new scale, but unfortunately repeatability seems to be around 10mg, so hardly better than 0.01g resolution scale.
Bough another one 500/0.01g scale in 2021. which looks the same. However, that might be rounding, just not that aggressive
.
I guess availability of calibration weight sets for $3 made manufacturers do this.
This scale round very aggressively, like X,970 is already rounded to X,997. So, there is easy way to test this rounding. Calibrate scale with 101g pretending to be 100. Then weighting 1g it will show 1.000g exactly, weighting 2g it will show something like 1.998g. But weighting both together you will get something like 2.960g
. However if manufacturers were smart and did not round that aggressively it would be way harder to prove.
For multimeters its way easy to gradually increase voltage so maybe it will not happen. But who knows. Most buyers don't know any better, buying cheap AD5584 and cheap multimeter showing 10.000 might be satisfying.
Also for resistance they already round shorted leads to zero. I wonder what is logic in that implementation.