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Sub-Etha Sens-O-Matic

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The Sub-Etha Sens-O-Matic is a small black device that alerts hitchhikers to passing spacecraft, by monitoring ships' Sub-Etha signals. Through this device, Ford Prefect learns that the Vogons are on their way to demolish the Earth.

AppearancesEdit

The Sub-Etha Sens-O-Matic appeared in:

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