Magnet Source Magnetic Field Viewer Card (Pack of 1) Description The Magnet Source Magnetic Field Viewer Card contains a 2 x 1.25" strip of viewing film to reveal the location and number of poles on a permanent magnet. The laminated card measures 2.5" x 4" and contains instructions and film.Science education products incorporate applied math and science principles into classroom and homeschool-based projects. Teachers in pre-K, elementary, and secondary classrooms use science education kits and products alongside science, technology, engineering, and math (STEM) curriculum to demonstrate STEM concepts and real-world applications through hands-on activities. Science education projects include a broad range of activities, such as practical experiments in engineering, aeronautics, robotics, energy, chemistry, physics, biology, and geology.Master Magnetics manufactures and distributes magnets for use in educational, commercial, and industrial environments under the Magnet Source brand. Founded in 1976, the company is headquartered in Castle Rock, Colorado. Features: Card contains a 2 x 1.25" strip of viewing film to reveal the location and number of poles on a permanent magnet 2.5" x 4" laminated card contains instructions and film Product Details: Color: Multi Color Material: Magnetic Brand: Master Magnetics Shape: Rectangular Product Dimensions ‏ : ‎ 3.75 x 2.75 x 0.13 inches; 0.18 Ounces Our Recommended age ‏ : ‎ 8 years and up Item model number ‏ : ‎ DMVC-1BX Date First Available ‏ : ‎ November 21, 2011 Manufacturer ‏ : ‎ Magnet Source Country of Origin ‏ : ‎ USA Best Sellers Rank: #112,152 in Office Products (See Top 100 in Office Products) #503 in Index Cards #503 in Index Cards Customer Reviews: 4.3 4.3 out of 5 stars 172 ratings