They claim +- .02 grain accuracy and the norm is +- .1 grain (good) or +- .2 (fair). It could be a coincidence but it seems likely that there was an error.
If I get a chance, I'll order the Gemini and try it. For the tiny cost, it would be worth buying if it's a reliable unit. I have several digital scales that didn't work well for powder charges but they still work great for weighing bullets or other components.
For the record, I have a Masters in technology but once you get old and retire, folks think a lifetime of training and experience simply evaporates. I don't care if folks believe me or not.
You gotta die of something.....It may as well be something that you like!
Loving the Harley idle....potato, potato, potato.