I have a Hornady GS-1500. comes with calibration weight and pan. it will weigh to one tenth grain (15.43 grains in a gram) and will do grain, gram, ounce and carat. it says graduation is .005g. It does have tare. I use it on the grain scale all the time and the accuracy seems to stay within a couple tenths of a grain compared to a balance beam. As Arne said I dont know if I would trust it with critical measurements like weighing powder for reloading. The advantage of a digital is the result is instantaneous.