3D Magnetic Field Demonstrator, 1 Each

The United Scientific® 3D Magnetic Field Demonstrator by United Scientific is a sealed, clear acrylic teaching device that displays the magnetic field around a magnet in three dimensions. Its center magnet has marked North and South poles and can be removed or flipped, and the hinged case opens to 180 degrees for viewing from every angle. Physics teachers use it to demonstrate field lines without loose filings or cleanup.