system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are some digital scales able to tell such little weight differences? (Such as between 0.00g and 0.01g)
gpt
The difference between 0.00g and 0.01 g is only little in terms of your perception of the world. There's 2.618*10^20 atoms in 0.01 grams of salt. (That's a lot) so if your method of finding out a sample's weight was counting atoms, then 0.01grams is an enormous weight. 

We, humans, are bad at weighing things. Digital sensors are not. The one in your kitchen scale works by converting the weight to a small current. More precise scales work by essentially having the scale vibrate, and measuring the degree to which the object you try to measure interferes with that vibration.