Page "Keyboard technology" Paragraph 20
from
Wikipedia
Hall effect keyboards use magnets and Hall effect sensors instead of an actual switch.
When a key is depressed, it moves a magnet, which is detected by the solid-state sensor.
These keyboards are extremely reliable, and are able to accept millions of keystrokes before failing.
They are used for ultra-high reliability applications, in locations like nuclear powerplants or aircraft cockpits.
They are also sometimes used in industrial environments.
These keyboards can be easily made totally waterproof.
They also resist large amounts of dust and contaminants.
Because a magnet and sensor is required for each key, as well as custom control electronics, they are very expensive.
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