18-inch Atomic Analog Wall Clock,18-inch Atomic Analog Wall Clock China Wholesale, custom-made 18-inch Atomic Analog Wall Clock, China 18-inch Atomic Analog Wall Clock Wholesale

Description

Radio-controlled (or "atomic") clocks and weather stations set themselves automatically by tapping into the time signal broadcast from the cesium fountain atomic clock located in Boulder, Colorado. Accurate to 1 second every 60 million years, the atomic clock signal is broadcast over North America by the National Institute of Standards and Technology.

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