Comment by drzaiusx11

Analog to digital converters (components generally built-in to uCs and SoCs but you can make them using simple resistor ladders) have common resolution ranging usually from 8bit to 24bit in most consumer hardware.

Resolution of +/- 500g just means there's not enough "steps" values in your ADCs provided bit depth: for example the 10bits on an attiny85 gives you 1024 discreet values you can map to weight values etc.