ECOTEST DKG-21 M Operating Manual page 78

Important! If the process of the clock settings correction is
paused for more than 30 seconds (the user presses no buttons
of the dosimeter), the dosimeter will automatically return to
the mode of real time indication. All changes made will be
canceled.
4.3.3.8 Indication and correction of alarm clock
settings
Press shortly the MODE button to enter this mode from
any other operating mode. This mode follows the mode of
real time indication.
A non-blinking ":" symbol between the two pairs of
digits on the LCD indicates you have entered the appropriate
mode.
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