I got one of these digital scales today at a kitchen store. I don't know how accurate the scale is- I drop a writing pen on the scale and it says 18 grams, and a plastic spoon is 3 grams, so I guess it's accurate enough (it also has a tare feature, so I can leave a bowl on top and measure with tea in it).
I've been making 2.5 grams per 6 ounces of water (how many mililiters is that?) with Longjing, brewing using cool 140 degree water for about 1 1/2 minutes. Well, I measured out two cups worth of tea (about 5 grams), and MY GOD THAT"S ALOT OF TEA. More than the two heaping teaspoons I usually use. I measured it out into a a tablespoon, and it makes about a heaping tablespoon.
So... about how many grams of tea per cup should a person use?