Well, if you are going to go all gram weenie on us, there is a postal scale. For myself, I can tell which things are lighter than others on the kitchen scale. If I am worried about weight at all, I load the pack up and weigh the whole load. A really simple way to tell if item A is lighter than item B (A and B would be used for the same purpose) is a simple counter balance. You don't really need to buy a scale for that. But that's just me, and I do not count grams (usually).