ECOTEST DKG-21 Operating Manual page 49

Each pressing will change the value per unit. Press shortly the MODE
button to correct the value of hours. The two digits to the left from the ":"
symbol start blinking at that. The hour value correction is performed
likewise. Press shortly the MODE button once again to exit the mode of real
time correction.
Important! If the process of the clock settings correction is paused for
more than 30 seconds (the user will not press the buttons of the dosimeter),
the dosimeter will automatically return to the mode of real time indication.
All changes made will be canceled.
4.3.3.9 Indication and correction of alarm clock settings, switching
alarm clock on/off
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 dLCD
indicates you have entered the appropriate mode.
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