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The core idea presented is using the iPad’s built-in magnetometer to monitor magnetic fields in the environment. The speaker notes that the device responds noticeably when passing over certain features like culverts or when large vehicles like trucks go by. This demonstrates how the iPad can function as a simple, low-cost magnetometer, providing visual or auditory cues based on its sensor readings.
By mounting the iPad in a vehicle or holding it by hand, users can observe real-time interactions with magnetic sources nearby. This makes it a handy tool for students, hobbyists, or anyone interested in exploring environmental magnetic variations without requiring specialized hardware.