Amazon.com: Ymiko Door & Window Sensors, 5pcs MC-38 Recessed Wired Door Window Sensor Magnetic Switch Home Alarm System for Wooden Door, Window : Tools & Home Improvement
Gebildet Plastic Reed Switch Reed Contact Closer (N/O) Magnetic Induction Switch (3 mm x 14 mm) with 20 Small Round Multi-Purpose Magnets Pack of 10 : Amazon.de: DIY & Tools
magnetisch Sensor-Schalter - SODIAL(R)10 Stueck Reedkontakt 14mm x 2mm Miniatur Reed Kontakt Reedschalter 44mm Laenge : Amazon.de: Baumarkt
Connect reed contact quickly and easily to Smartphone - Sensate
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Arduino Lektion 90: Reed Kontakt Sensor Modul - Technik Blog
Amazon.com: Velleman HAA27 Reed Switch for Alarm : Electronics