Feature: 100% Brand New and High Quality Magnetic Magnetic Field Watching Film1. Easy to use: just place the card on the surface of the magnetic material and it will reveal the magnetic field of the pattern.2. Great for personal or scientific research. It can help us study magnetic fields that we cannot see.3. It can be used for quality control, product demonstration, reverse engineering, certification, and educational purposes.4. Small and portable, lightweight, easy to carry.5. A great educational tool that will arouse our interest in learning.6. The magnetic field viewer is a micro-encapsulated film that allows the user to see the static magnetic field.7. Highly flexible film is suitable for magnetic surfaces with any protrusion or cavity. Specifications:Material: Magnetic Field Watching FilmColor: YellowSize: 85*100mmPackage Included:1x Magnetic Field Watching FilmNote:Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Manual measurement, please allow 1-10mm error. Thank you for your understanding.