What size is the cylindrical hole in the center of the cube?

1/2". The device comes with a magnet to to fit into the hole. A 1/2" by 3" cow magnet work fine as well.

What is the maximum size magnet that will fit in the tube?

Ours came with a three (3") inch cow magnet. I bought extras in case one gets lost as they do. The device works great with students demonstrating magnetic fields in 3D. Hope this is useful. Richard

What is the ID of the tube?

A three inch long 1/2" dia cow magnet fits perfectly. It also comes with its own cow magnet. 0.5'is the ID of this device.

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🧲 Unlock the invisible forces around you with style and clarity!

MULTI MAGNET COMPATIBLE - Experiment with multiple magnets simultaneously for advanced study.
ZERO MAINTENANCE REQUIRED - No ironing or upkeep—just pure magnetic fascination.
MAGNETIC MASTERY IN A CUBE - Visualize complex magnetic fields effortlessly from every angle.
CRYSTAL CLEAR ACRYLIC DESIGN - Perfect for overhead projection and professional classroom demos.
MESS FREE MAGNETIC EXPLORATION - No spills, no iron filings scattered—pure clean science.

The American Scientific 磁気フィールドキューブ is a 3-inch transparent acrylic cube filled with iron filings suspended in solution, allowing 360-degree observation of magnetic fields. Designed for clean, multi-magnet experiments, it’s ideal for professional demonstrations and classroom use with overhead projection compatibility, requiring no batteries or maintenance.

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Number of Game Players	1
Batteries Required?	No
Batteries Included	No
Material Type(s)	アクリル
Target Gender	Unisex
Manufacturer recommended age	18 years and up
Product Dimensions	11.43 x 10.16 x 11.43 cm; 449 g
ASIN	B076P3MR67

American Scientific 磁気フィールドキューブ

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