Float and Spin Magnet Demonstrator, 1 Each

The Float and Spin Magnet Demonstrator by United Scientific shows magnetic repulsion with a 5" axle that levitates above magnets built into its base, kept in place by a clear acrylic plate. A twist of the fingers sets it spinning, and its black and white pattern makes rotation easy to follow. No batteries are needed, making it a quick discussion starter for physics classes.