Can you write on this causing a magnetic image to appear if you attached a small neodymium magnet to the end of dried up pen?

Only if you have a small enough magnet, otherwise the characters would be so large you could only write one word.After reading "Sadly, no." I tried with a small motor magnet and was able to produce "123" and "Hi" that were legible from the front.Not sure if that is useful for you.

Will this show the tracks on magnetic audio tape?

Not usefully. It might just show some magnetic field on a cleverly recorded tape (eg: Like a lightning flash recorder), but neither the resolution nor the contrast would show normal audio tracks. That is simply not it's function.

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Magnet Source Magnetic Field Viewer Card (Pack of 1)

Magnet Source Magnetic Field Viewer Card (Pack of 1)

Product ID: 7091802

Details

Brand
Master
Color
['White +
Global Trade Identification Number
Manufacturer
Magnet Source
Material
Plastic
Number of Pieces
1

📏2.5" x 4" compact laminated card

📚Includes clear step-by-step instructions

🔍2 x 1.25" magnetic viewing film strip

Description

🔮 Unlock the invisible world of magnets—see what others can’t!

DURABLE LAMINATED DESIGN - Engineered with sturdy plastic lamination to withstand daily use in classrooms, labs, or fieldwork without wear.
PRECISION POLE DETECTION - Reveal the exact location and number of magnet poles with the high-clarity viewing film strip—perfect for STEM pros and curious minds alike.
STEM READY EDUCATIONAL TOOL - Ideal for hands-on learning, this card bridges theory and real-world magnetism applications, making complex concepts instantly visible.
POCKET SIZED MAGNETIC INSIGHT - Carry a sleek, durable card that fits right in your wallet for instant magnetic field visualization anywhere.
TRUSTED BY PROFESSIONALS EDUCATORS - Backed by Master Magnetics’ decades of expertise, this tool is a must-have for engineers, teachers, and tech-savvy millennials pushing innovation.

The Magnet Source Magnetic Field Viewer Card is a compact, laminated plastic card featuring a 2 x 1.25" strip of specialized viewing film that visually reveals the location and number of poles on permanent magnets. Measuring 2.5" x 4", it includes clear instructions and is designed for educational, professional, and industrial use, making magnetic fields instantly visible for STEM learning and practical diagnostics.

Specifications

ASIN	B005HYCM8M
Best Sellers Rank	#165,685 in Office Products ( See Top 100 in Office Products ) #566 in Index Cards
Brand Name	Master Magnetics
Color	['White + Green']
Customer Reviews	4.2 4.2 out of 5 stars (202)
Global Trade Identification Number	00095421005635, 10095421005632
Included Components	Magnetic Field Viewer Card
Item Type Name	Magnetic Field Viewer Card
Manufacturer	Magnet Source
Manufacturer Part Number	DMVC-1BX
Material Type	Plastic
Model Number	DMVC-1BX
Number of Pieces	1
Shape	Rectangular
Size	2.5" x 4"
UPC	095421005635
Unit Count	1.0 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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