I researched long and hard before buying this American Weigh scale. The cover is nice since it sits on my counter all the time. You can run either battery or wall power (though I've been using it for like 8 months and haven't changed the battery). The best thing is it does have auto power off but on a very long time, like 8-10 min.

just a gram scale that at least includes one point.I have a aws LB-3000 scale I use for it. I got it back when I started making my e-juice for my vape. https://www.amazon.com/American-Weigh-LB-3000-Compact-Removable/dp/B002SVNEWA