And this is to be used for gunpowder? or yourself?... Scales for different needs... say for around 200 grams or thereabouts a cheap $20 digital works fine for many years... for precision a scale can be from hundreds to the sky. For weighing a pipe, tobacco, or yourself, who cares how accurate, for weighing a charge for a cartridge...you better care.
I would say for your use, a look at Amazon or the like, a digital that has the capacity you think you need should be from 10 to 30 bucks, buy a spare battery, your done.