Casio MR-G 5068 User Manual page 27

Note that transmission of the Japanese calibration signal may
be interrupted occasionally due to maintenance, lightning, etc.
For more information, visit the website of the Japan Standard
Time Group of the National Institute of Information and
Communications Technology (NICT) at the following URL.
http://jjy.nict.go.jp
•
Note that the above URL is subject to change.
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