Officials say it’s three times as accurate as its predecessor.
The U.S. Department of Commerce's National Institute of Standards and Technology announced the new clock, called NIST-F2, on Thursday.
An atomic clock is designed to measure time according to vibrations within atoms.
NIST-F2 is now an official source of time for the United States — it has an accuracy that's equivalent to about one second in 300 million years.
NIST-F2 about three times as accurate as NIST-F1.
For now, NIST plans to simultaneously operate both NIST-F1 and NIST-F2.
Scientists hope long-term comparisons will lead to improvements in both clocks as they serve as U.S. standards for civilian time.
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