For 3-D demonstrations of magnetic fields.
Tube size: 4" H x 3" diam.
Comes with multilingual activity booklet.
Redesigned for superior viewing over its lifetime, the Magnetic Field Tube is a sealed plastic display cylinder (now scratch resistant) containing 1.3 oz of steel filings.
The cylinder has a 1/2"-diam hole through its center in which to insert the super strong alnico cylindrical magnet (included).
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