{"product_id":"magnetic-field-viewer-card-25-30-50mm-pattern-display-film","title":"Magnetic Field Viewer Card 25\/30\/50mm – Pattern Display Film","description":"\n\u003ch2\u003eSee the Invisible — Visualize Magnetic Fields Instantly\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMagnetic Field Viewer Card\u003c\/strong\u003e is a compact, flexible encapsulation film that makes static magnetic fields visible to the naked eye. Simply place the card over any magnet or magnetized surface and watch the hidden field pattern appear in vivid detail. Available in three sizes — \u003cstrong\u003e25×25mm, 30×30mm, and 50×50mm\u003c\/strong\u003e — this handy tool is perfect for students, engineers, hobbyists, and quality-control professionals alike. Made in China.\u003c\/p\u003e\n\n\u003ch3\u003eWhy You'll Love It\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstant Magnetic Visualization:\u003c\/strong\u003e Reveals the shape and pattern of static magnetic fields in real time — no power source required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Film Design:\u003c\/strong\u003e Highly pliable ABS-encapsulated film conforms to both convex and concave magnetic surfaces for accurate field mapping.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Use Applications:\u003c\/strong\u003e Ideal for quality control, product demonstration, reverse engineering, certification testing, and science education.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Portable:\u003c\/strong\u003e Slim, lightweight card fits easily in a pocket, toolbox, or lab kit — take it anywhere.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStimulates Scientific Curiosity:\u003c\/strong\u003e A fantastic educational aid for classrooms, science fairs, and personal research projects.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrue Color \u0026amp; Gray Effects:\u003c\/strong\u003e Displays field patterns in both true-color and grayscale modes depending on the viewing angle and light.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMagnetic Field Viewer \/ Observer Card\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAvailable Sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25×25mm | 30×30mm | 50×50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYellow (card body)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay Effect\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTrue Color \u0026amp; Gray\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eABS Plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 piece per order\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Magnetic Field Viewer Card (size of your choice)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePlease Note\u003c\/h3\u003e\n\u003cp\u003eAllow 1–2 cm tolerance due to manual measurement. Actual color may vary slightly from product images due to monitor differences.\u003c\/p\u003e\n\n\u003ch3\u003eExplore More Science \u0026amp; DIY Tools\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-25mm-1000-turn-precision-copper-inductor-coil-diy-electronics\"\u003e0.25mm 1000-Turn Precision Copper Inductor Coil for DIY Circuits\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-300mm-adjustable-pcb-holder-360-rotation-soldering-stand-clamp\"\u003e0–300mm PCB Holder Stand | 360° Rotation Soldering Clamp\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on magnetic fields and their scientific applications, visit the U.S. Department of Energy – Basic Energy Sciences resource.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Photodetector\" target=\"_blank\" rel=\"noopener\"\u003ePhotodetector\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What sizes does the Magnetic Field Viewer Card come in?\u003c\/h4\u003e\n\u003cp\u003eA: The magnetic field viewer is available in three sizes: 25×25mm, 30×30mm, and 50×50mm. Choose the size best suited to your magnet or application — the 50×50mm card is great for larger surfaces, while the 25×25mm card is ideal for small or precision magnets.\u003c\/p\u003e\n\u003ch4\u003eQ: How does the Magnetic Field Viewer Card work?\u003c\/h4\u003e\n\u003cp\u003eA: The card contains a specially formulated encapsulation film with micro-particles that align with magnetic field lines when placed on or near a magnetized material. This alignment creates a visible pattern that maps out the shape and polarity of the magnetic field — no batteries or electricity needed.\u003c\/p\u003e\n\u003ch4\u003eQ: Can it be used on curved or uneven magnet surfaces?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The film is highly flexible and conforms to both convex and concave magnetic surfaces, making it suitable for round magnets, irregular shapes, and flat surfaces alike.\u003c\/p\u003e\n\u003ch4\u003eQ: What are common uses for this magnetic field viewer?\u003c\/h4\u003e\n\u003cp\u003eA: This tool is widely used in science education, classroom demonstrations, quality control inspections, reverse engineering, product certification, and personal scientific research. It's also a popular tool for hobbyists working with electronics, motors, or custom magnet arrangements.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What sizes does the Magnetic Field Viewer Card come in?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The magnetic field viewer is available in three sizes: 25×25mm, 30×30mm, and 50×50mm. 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The film is highly flexible and conforms to both convex and concave magnetic surfaces, making it suitable for round magnets, irregular shapes, and flat surfaces alike.\"}}, {\"@type\": \"Question\", \"name\": \"What are common uses for this magnetic field viewer?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This tool is widely used in science education, classroom demonstrations, quality control inspections, reverse engineering, product certification, and personal scientific research. It's also a popular tool for hobbyists working with electronics, motors, or custom magnet arrangements.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/oasis-select.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Magnetic Field Viewer Card 25\/30\/50mm – Pattern Display Film\", \"item\": \"https:\/\/oasis-select.com\/products\/magnetic-field-viewer-card-25-30-50mm-pattern-display-film\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"True Color 25x25mm","offer_id":47748277731433,"sku":"14:200026864#True Color 25x25mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"grey 30x30mm","offer_id":47748277764201,"sku":"14:173#grey 30x30mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"grey 25x25mm","offer_id":47748277796969,"sku":"14:29#grey 25x25mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"True Color50x50mm","offer_id":47748277829737,"sku":"14:10#True Color50x50mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"True Color 30x30mm","offer_id":47748277862505,"sku":"14:350853#True Color 30x30mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"green 25x35mm","offer_id":47748277895273,"sku":"14:350686#green 25x35mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"green 40x45mm","offer_id":47748277928041,"sku":"14:201782807#green 40x45mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"green 30x50mm","offer_id":47748277960809,"sku":"14:366#green 30x50mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"grey 50x50mm","offer_id":47748277993577,"sku":"14:193#grey 50x50mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"green 30x30mm","offer_id":47748278026345,"sku":"14:496#green 30x30mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"green  50x50mm","offer_id":47748278059113,"sku":"14:175#green  50x50mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"green 50x75mm","offer_id":47748278091881,"sku":"14:94#green 50x75mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"green 25x50mm","offer_id":47748278124649,"sku":"14:350852#green 25x50mm","price":7.62,"currency_code":"USD","in_stock":true},{"title":"green 25x25mm","offer_id":47748278157417,"sku":"14:691#green 25x25mm","price":7.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S06027b5247d743f79a1336ff1d8100b4G.webp?v=1783082781","url":"https:\/\/oasis-select.com\/products\/magnetic-field-viewer-card-25-30-50mm-pattern-display-film","provider":"Oasis Select","version":"1.0","type":"link"}