{"product_id":"magnetic-field-viewer-film-card-25x50mm-50x75mm","title":"Magnetic Field Viewer Film Card – 25x50mm \u0026 50x75mm","description":"\u003cp\u003eVisualize invisible magnetic fields instantly with this \u003cstrong\u003eMagnetic Field Viewer Film Card\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003ch2\u003eWhy You'll Love This Magnetic Field Viewer\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstant Visual Display:\u003c\/strong\u003e Place over any magnet to immediately reveal the magnetic field pattern — no batteries, no setup required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTwo Convenient Sizes:\u003c\/strong\u003e Comes in \u003cstrong\u003e25×50mm\u003c\/strong\u003e and \u003cstrong\u003e50×75mm\u003c\/strong\u003e — choose the size that suits your application, or use both for different magnets.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2 Color Options:\u003c\/strong\u003e Available in multiple color variants to suit your preference.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePortable \u0026amp; Pocket-Sized:\u003c\/strong\u003e Slim card design slips easily into a bag, pocket, or toolkit — always on hand when you need it.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReady to Use:\u003c\/strong\u003e Works right out of the box — no assembly or calibration required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGreat for Education \u0026amp; Research:\u003c\/strong\u003e Ideal for classroom demonstrations, DIY electronics projects, magnet pole identification, and personal scientific exploration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 25×50mm \/ 50×75mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eForm Factor:\u003c\/strong\u003e Flat film card\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUse:\u003c\/strong\u003e Magnetic field visualization\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAvailable Colors:\u003c\/strong\u003e 2 options\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReady to Use:\u003c\/strong\u003e Yes — no setup needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003cp\u003eFor more information on magnetic fields and their properties, visit the U.S. Department of Energy's explanation of electric and magnetic fields.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does the Magnetic Field Viewer Film Card actually show?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What sizes does the magnetic field viewer film come in?\u003c\/h4\u003e\n\u003cp\u003eA: The magnetic field viewer film is available in two sizes: \u003cstrong\u003e25×50mm\u003c\/strong\u003e (ideal for small magnets and precision work) and \u003cstrong\u003e50×75mm\u003c\/strong\u003e (better suited for larger magnets or broader field visualization).\u003c\/p\u003e\n\n\u003ch4\u003eQ: Who is the Magnetic Field Viewer Film Card useful for?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does the magnetic field viewer card require any batteries or special equipment?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the Magnetic Field Viewer Film Card actually show?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"What sizes does the magnetic field viewer film come in?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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).\"}}, {\"@type\": \"Question\", \"name\": \"Who is the Magnetic Field Viewer Film Card useful for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"Does the magnetic field viewer card require any batteries or special equipment?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — the magnetic field viewer film card is completely passive and requires no batteries, power source, or additional equipment. 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