Hygro-Thermometer Alarm Clock - Extech Instruments
Atomic Desktop A lann Clock Model Number: 13131 About the Atomic Clock The National Institute of Standard and Technology (MST) in Fort Collins, Colorado broadcasts the time signal (WWVB at 60kHz ANI radio signal) with an accuracy of 1 second per every 3,000 years. The signal will able to cover over a distance up to 2,000 miles from the source. ................
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