Description:OOTDTYComs:100% Brand New and High QualityThis item is easy to use. Just place the card on the surface of the magnetic material and it will reveal the magnetic field of the pattern. Great for personal or scientific research. It helps us study magnetic fields that we can't see. It can be used for quality control, product demonstration, reverse engineering, authentication and educational purposes. Compact and portable size, lightweight, convenient to carry with you. A great educational tool to stimulate our interest in learning. The magnetic field viewer is a micro-encapsulated film that makes the user's view a static magnetic field. Highly flexible film is suitable for magnetic surfaces with any degree of convexity or concavity. Specification:Dimensions: 50x50mm (1.97x1.97 inches) (Approx.) Color: Dark Green Quantity: 1 pcNote:Transition: 1cm=10mm=0.39 inchNo retail package. Please allow 1-3mm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Included:1 x Magnetic Field Viewer (Other accessories demo in the picture are not included.)