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It's what it says on the tin: Freeze Alarm - Black Ice

It's a device used by bikers to trigger an alarm when the temp drops and there's a danger of ice on the road. Same thing as on modern vehicles when the outside temperature indication starts to blink under 3 degrees C.

See http://en.wikipedia.org/wiki/Black_ice and a similar device at http://www.aerostich.com/product.php?produ...=270&page=1

Probably used as a simple inside thermometer.

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