I've used the Gemini for years and it's an excellent scale, especially for its price. But its auto-off "feature" always annoyed the shit out of me and made me rush my weighings to avoid having the scale shut off. I recently added the following scale to my collection and find it's better than the Gemini in many ways, although a bit more expensive. Comparing it to my Gemini shows it to be as accurate, and it can run on wall power. I can leave it running and turned on at all times so it stabilizes well. I found it does a decent job with sub-20 mg weighings. I do use volumetric methods, but there are times I prefer small amounts of dry material and don't want to spring for a $500+ analytical balance.