You literally put a bowl on scale and add to it the semi correct number of grams.
Or alternatively put the package on scale and remove until scale shows correct number of negative grams.
Same with liquids since 1g = 1ml roughly.
It couldn’t be easier. Also some packages eg butter have gram measuring lines written on them.
Most of the time you don’t even use it unless it’s baking or fermenting or anything else where its hard to do it by feel.
You literally put a bowl on scale and add to it the semi correct number of grams. Or alternatively put the package on scale and remove until scale shows correct number of negative grams.
Same with liquids since 1g = 1ml roughly. It couldn’t be easier. Also some packages eg butter have gram measuring lines written on them. Most of the time you don’t even use it unless it’s baking or fermenting or anything else where its hard to do it by feel.