grams, resolution 1 gram or 2 grams, up to 2000 grams or 5000 grams. kitchen scale.

i had a laboratory scale at my disposal for a while. really fun. it resolved the weight of a signature done with a ball point pen. the paper gained weight, the pen lost weight. frightening. resolution 0.00001 gram. truly heisenberg. the same coin would give different readings depending on its temperature because hot air rises up.

anyway what you want is to delete ounces and pounds from your mind, these are dead, and 1000 grams are a kilogram and 1000 kilograms is a metric ton. its just so base 10 linear, really easy, it even covers the megaton range you might know from talk about thermonuclear weapons.

then just buy a digital scale, kitchen scale.