how to use a digital scale for legal marijuana?

how to use a digital scale for legal marijuana?

ok so i don’t know anything about weighing at all i don’t know know how much a eighth or half or quarter or zip lol i basically don’t know crap about how much things should weigh at all so if someone can help me with that it would be helpfull to start with….

also how do you use a scale? i just went to two cannabis clubs and it seems like i am getting jipped by the way it looks i just wanna learn how to use a scale so i can weigh it when i buy it too….

details instructions?
yes the marajuanna is legal i dont but it from dealers i go to the cannibus clubs in sanfransisco
and i hella didnt ask for an opinion i want answers lol yahoo answers not yahoo opinions