Picture of Magnetic Stir Plate
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A magnetic stir plate is used to mix a liquid. It's magnet spins around and makes a metal object in the liquid create a vortex to mix it. This project cost me $20-25 but could be more if you don't have some things that I had lying around. Please vote for me!

Step 1: Parts List

Picture of Parts List
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You will need: A computer fan, A container that fits your computer fan, 2 9-volt batteries, 2 9-volt battery snaps, Wire, Potentiometer, Knob that fits the center rod of your potentiometer, Velcro, Magnet (I used 3), Piece of metal like a nail, Jar, Electrical tape, Optional: soldering iron and solder.