yea but even if you can judge based on eye, what are you gona do, "hey man i think yuo ripped me" dealer: "no man i weighted it, its right trust me" you: "well...uh...ok cya" theres nothing you can do, no dealer is gona give you more weeed just cuz ur not "satisfied". but w/e, just get ur own scale or tell people u have one thus reducing ur chances of getting ripped.