This magnetic stir plate holds flasks up to 5 litres. This stir plate features an on/off switch, as well as a dial for speed control. There is also a screw-in fuse in the back, and it uses standard 110V Power.
Using stir plates with magnetic stir bars helps to increase aeration, growing your cell count. Yes, you can do this manually, but imagine how your arm would feel.
A helpful hint from some experienced homebrewers - purchase an extra magnetic stir bar. There are two reasons for this. One, stir bars are easily misplaced, so having a backup on hand means you are ready to make your next starter. Two, before you pitch your starter, use the extra stir bar on the outside of your flask and connect to one inside your flask, holding it to the side or bottom so that you don't toss it in with your starter.