I found a bit of a quirk with the chargemaster last night. If you're at Zero with the powder tray on it and you very slowly drop 1-3 granules of powder every second or so, it will keep re-zeroing itself. If you drop it right you could probably fill the the whole dish and still have it read 0. I had about 4-5 grains of powder into mine when I dropped a little too much and it registered....but it only showed the weight of the amount that I dropped at that time, not the rest of the powder that was in the tray already.
This may a problem if your weighing small amounts of flake or ball powder. I have only measured extruded so far myself.
Richard