Magnetic Reed Switch (The "Original" Hall Effect Sensor)(4K) - YouTube
Fundamentals of magnetic sensors: differences between AMR sensors (magnetic switches) and reed switches | Basic Knowledge of AMR Sensors (Magnetic Switches) | Murata Manufacturing Co., Ltd.
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10pcs 4x28MM Reed Switch Sensor Normally Open DIY Magnetic Reed Switches Electronic NO 4*28mm - AliExpress
How reed switches work (magnetically operated switches)
Magnetic Sensors and Reed Switches - Littelfuse
Reed Switch/Sensor - Magnetic Switch - 16mm buy online at Low Price in India - ElectronicsComp.com
Reed Switch Sensor Module For Arduino - Rytronics.in