Devices consisting of a glass tube containing two small ferromagnetic metal reeds are called?

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Magnetic reed switches are glass-encased devices that contain two ferromagnetic reeds. In the presence of a magnetic field, the reeds are attracted to each other and close the circuit; when the field is removed, the reeds separate and open the circuit. The glass tube housing and the pair of reeds are distinctive, which is why this term fits the description. Hall effect sensors are solid-state devices that sense magnetic fields without moving parts, photoelectric sensors use light to detect objects, and proximity sensors cover various non-contact sensing methods, but they do not describe the glass-encased two-reed switch.