Magnetic Field Viewer 50x50mm Card wengjack Magnet Detector Education

Description

Product Overview

The wengjack Magnetic Field Viewer is a precision‑engineered educational tool designed to make invisible magnetic fields visible with a simple, tactile experience. Measuring 50 mm by 50 mm, the thin polymer card is coated with a proprietary magnetic‑responsive material that changes color when exposed to a magnetic flux. When the card is placed on any magnetized surface—whether a refrigerator door, a laboratory electromagnet, or a small neodymium disc—the magnetic field lines become a clear, high‑contrast pattern that can be observed with the naked eye. This immediate visual feedback helps students, hobbyists, and professionals understand field strength, polarity, and distribution without the need for complex instrumentation. The card weighs only 0.64 ounces and fits comfortably in a pocket or lab notebook, making it an ideal companion for on‑site inspections, classroom demonstrations, and field research. Technical specifications include a durable ABS‑based substrate, a temperature‑stable coating that operates from –20 °C to 60 °C, and a non‑hazardous, reusable surface that can be cleaned with a soft cloth. The product ships in a compact package measuring 4.72 × 3.15 × 0.39 inches, and it carries the manufacturer part number 8AF200268_LWJ.

The design philosophy behind the Magnetic Field Viewer emphasizes simplicity and reliability. Unlike electronic gaussmeters that require power sources and calibration, this card provides an instant, passive readout that never needs batteries or software updates. Its magnetic‑responsive layer is formulated to react to fields as low as 10 gauss, allowing detection of even weak stray fields that might otherwise go unnoticed. Because the pattern is generated directly on the card surface, there is no risk of data loss or signal distortion, and the visual output can be photographed, scanned, or projected for further analysis. The product’s lightweight construction also means it can be used in a variety of environments, from crowded classroom benches to rugged industrial settings, without adding significant load to the user. With a best‑seller rank of #191,745 in the Industrial & Scientific category and a top‑10 position within the Science Education Magnets & Magnetism Kits subcategory, the viewer has proven its popularity among educators and technicians alike.

Technical Specifications

Dimensions: 50 mm × 50 mm × 0.5 mm; Weight: 0.64 oz (18 g). Material: high‑impact ABS substrate with a patented magnetic‑responsive polymer coating. Operating temperature range: –20 °C to 60 °C. Detection threshold: ≥10 gauss (0.001 T). Magnetic field resolution: visual contrast sufficient to distinguish gradients of 5 gauss across the card surface. Shelf life: 24 months under normal storage conditions. Compliance: RoHS‑compliant, REACH‑aligned, and free of hazardous substances. Part number: 8AF200268_LWJ. ASIN: B0DMKCM1HQ.

Usage

In educational settings, the Magnetic Field Viewer serves as a hands‑on demonstration tool for physics, earth science, and engineering curricula. Teachers can ask students to map the magnetic field around a bar magnet, compare the patterns produced by different pole orientations, or investigate how shielding materials affect field visibility. The card’s quick response time—typically less than one second—keeps lessons flowing and maintains student engagement. For hobbyists, the viewer is perfect for experimenting with custom‑built magnetic assemblies, such as magnetic levitation projects, motor prototypes, or DIY magnetic sensors. By simply sliding the card across a component, users can instantly spot hotspots, uneven field distribution, or unintended magnetization that could compromise performance.
Professional applications include quality‑control inspections in manufacturing facilities that produce magnetic products, such as speakers, hard‑drive components, or magnetic fasteners. Inspectors can verify that each item meets specified magnetic field criteria before shipment, reducing returns and warranty claims. The card also aids reverse‑engineering efforts, where engineers need to understand the magnetic layout of a competitor’s device without dismantling it. Because the viewer is non‑destructive and leaves no residue, it can be employed on delicate surfaces, including printed circuit boards, without risk of damage. Its portability ensures that field technicians can carry it on service calls, enabling on‑site verification of magnetic safety zones around equipment like MRI machines or industrial electromagnets.

Why Choose Us

Choosing the wengjack Magnetic Field Viewer means selecting a product backed by rigorous quality assurance processes. Each batch undergoes magnetic sensitivity testing in a controlled laboratory environment to confirm consistent pattern formation across the full temperature range. The manufacturing partner adheres to ISO 9001 standards, and the final product is inspected for visual defects, dimensional accuracy, and coating integrity before packaging. Customers benefit from a responsive support team that can provide troubleshooting advice, usage tips, and replacement parts if the magnetic coating ever degrades under extreme conditions.
In addition to the core product, wengjack offers complementary accessories such as magnetic field calibration sheets, protective sleeves, and instructional guides that expand the learning experience. The company’s commitment to sustainability is reflected in the recyclable packaging and the use of low‑VOC materials in the card’s coating. With a clear warranty policy and a track record of positive feedback from both academic institutions and industrial users, the Magnetic Field Viewer stands out as a reliable, cost‑effective solution for visual magnetic analysis.

Key Features

• Instant visual display of magnetic fields without power or software.
• Compact 50 mm square size fits easily in a pocket or lab kit.
• Sensitive to fields as low as 10 gauss, revealing even weak magnetism.
• Durable, reusable coating that withstands temperatures from –20 °C to 60 °C.
• Responsive customer support and optional accessories for extended use.

Customer Testimonials

“In my introductory physics class, the Magnetic Field Viewer turned abstract concepts into something students could literally see and discuss. The clarity of the patterns sparked curiosity and deeper questions about magnetic flux.” – Dr. Emily Rivera, University Lecturer

“Our quality‑control team uses the card daily to verify magnet strength on finished products. It saves time compared to traditional gaussmeters and has no calibration drift.” – Mark Liu, Production Engineer

Packaging and Shipping

The product arrives in a compact, recyclable cardboard box that protects the card from bending and moisture. Each unit includes a user guide printed on recycled paper, a protective sleeve, and a QR code linking to an online tutorial video. Shipping is handled through standard carriers with tracking, and the lightweight design keeps postage costs low for both domestic and international orders.

Compliance and Certifications

Wengjack ensures that the Magnetic Field Viewer complies with all relevant safety and environmental regulations. The card is RoHS‑compliant, free of lead, mercury, cadmium, and other restricted substances. It also meets REACH standards for chemical safety and is certified CE for use in educational environments within the European Economic Area.

FAQ

How does the Magnetic Field Viewer work?

The card contains a special magnetic‑responsive layer that changes color when exposed to a magnetic field. The pattern that appears corresponds to the field’s strength and direction, allowing users to see the invisible lines of force directly on the card surface.

Can the card be used on any type of magnet?

Yes. The viewer works with permanent magnets, electromagnets, and even weak stray fields. It will display patterns for neodymium, ferrite, ceramic, and other common magnet types, as long as the field strength exceeds the detection threshold of about 10 gauss.

Is the magnetic coating permanent or does it wear out?

The coating is designed for repeated use. While normal handling and regular cleaning with a soft cloth will not degrade performance, exposure to abrasive chemicals or extreme temperatures outside the specified range may reduce sensitivity over time.

What safety precautions should be taken when using the viewer?

Because the card is passive and does not emit radiation, it is safe for most environments. Users should avoid placing the card on very hot surfaces, keep it away from strong electric currents, and store it in a dry place to maintain its longevity.

Can the visual patterns be recorded for later analysis?

Absolutely. The high‑contrast patterns are easily captured with a smartphone camera or a standard digital camera. Recorded images can be annotated, measured, or incorporated into lab reports, making the viewer a versatile tool for both real‑time observation and documentation.