Magnetic Field Viewer Film Card – 25x50mm & 50x75mm

Visualize invisible magnetic fields instantly with this Magnetic Field Viewer Film Card. Simply place the card over any magnet or magnetic material and watch as a vivid, patterned display of the magnetic field appears before your eyes. Perfect for science education, hobbyist experiments, magnet testing, and quality inspection.

Why You'll Love This Magnetic Field Viewer

• Instant Visual Display: Place over any magnet to immediately reveal the magnetic field pattern — no batteries, no setup required.
• Two Convenient Sizes: Comes in 25×50mm and 50×75mm — choose the size that suits your application, or use both for different magnets.
• 2 Color Options: Available in multiple color variants to suit your preference.
• Portable & Pocket-Sized: Slim card design slips easily into a bag, pocket, or toolkit — always on hand when you need it.
• Ready to Use: Works right out of the box — no assembly or calibration required.
• Great for Education & Research: Ideal for classroom demonstrations, DIY electronics projects, magnet pole identification, and personal scientific exploration.

Product Specifications

• Sizes: 25×50mm / 50×75mm
• Form Factor: Flat film card
• Use: Magnetic field visualization
• Available Colors: 2 options
• Ready to Use: Yes — no setup needed

How It Works

The viewer film contains micro-encapsulated ferromagnetic particles suspended in a liquid carrier. When the card is placed near a magnet, these particles align along the magnetic field lines, creating a clear, visible pattern that maps the field's shape and polarity — making abstract magnetic forces easy to see and understand.

For more information on magnetic fields and their properties, visit the U.S. Department of Energy's explanation of electric and magnetic fields.

Frequently Asked Questions

Q: What does the Magnetic Field Viewer Film Card actually show?

A: When placed directly on or near a magnet or magnetic material, the viewer film card instantly displays a patterned visual map of the magnetic field — revealing pole locations, field strength distribution, and flux line patterns that are otherwise invisible to the naked eye.

Q: What sizes does the magnetic field viewer film come in?

A: The magnetic field viewer film is available in two sizes: 25×50mm (ideal for small magnets and precision work) and 50×75mm (better suited for larger magnets or broader field visualization).

Q: Who is the Magnetic Field Viewer Film Card useful for?

A: This viewer card is a great tool for students, science teachers, electronics hobbyists, magnet collectors, and anyone who wants to identify magnet poles, inspect magnetization patterns, or explore magnetic fields in an educational or DIY context.

Q: Does the magnetic field viewer card require any batteries or special equipment?

A: No — the magnetic field viewer film card is completely passive and requires no batteries, power source, or additional equipment. Simply place it on a magnet and the field pattern appears immediately.