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 shaping your world—magnetism made mesmerizing!

COMPACT PORTABLE - At just 3 inches square and under half a kilo, it fits effortlessly on your desk or in your bag for spontaneous inspiration.
PROJECTION READY DESIGN - Transparent acrylic cube doubles as an overhead projector tool, elevating classroom or boardroom presentations.
MULTI MAGNET COMPATIBILITY - Experiment with multiple magnets simultaneously to unlock complex field interactions and impress your peers.
MESS FREE MAGNETIC EXPLORATION - Forget stray filings—this sealed solution keeps your workspace pristine while delivering dynamic magnetic patterns.
VISUALIZE MAGNETISM LIKE NEVER BEFORE - Crystal-clear cube lets you explore magnetic fields from every angle—perfect for hands-on learning or sleek office demos.

The American Scientific Magnetic Field Cube is a 3-inch clear acrylic cube filled with iron filings suspended in solution, enabling mess-free, 3D visualization of magnetic fields. Designed for ages 18+, it supports multiple magnets at once and is ideal for educational demonstrations or professional presentations, with no assembly or batteries required.

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Product Dimensions	11.43 x 10.16 x 11.43 cm; 449 g
Manufacturer recommended age	18 years and up
Educational Objective(s)	Understanding of Magnetic Fields
Number of Game Players	1
Assembly Required	No
Batteries Required?	No
Batteries Included?	No
Material Type(s)	Acrylic
ASIN	B076P3MR67

American Scientific Magnetic Field Cube

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