a dollar bill wieghs a gram exactly... usually theres directions on the scale....


u need a 100 gram weight to calibrate most scales ive been through... just put it on and if it reads '100.0' then your cool...if it says anything else hold down the 'mode' button for a couple seconds untill the screen says 'CAL PASS' or the like...

and of course make sure you're in an area with no wind and u have a PERFECTLY even surface....