do u have a scale?if u dont have a scale,there is no accurate way to tell.some weed is denser,lighter,heavier,some people add stuff to make it heavier,all that shit.there is no way to tell if it is the kind he says,but tell him u want to see it weighed out.on s scale,it should say 3.5.if he gives u anything less,ur getting ripped.more is ok though.and 50 dollarz for 3.5 grams?thats some b-u-l-l-s-h-i-t.an 1/8 should only be 35 dollars