ECOTEST DKG-21 M Operating Manual page 77

Press the THRESHOLD button and hold it down until
two digits to the right from the ":" symbol start blinking to
correct the value of real time. Release the button
afterwards. The proper values of units and tens of minutes
are fixed by further pressing and holding down the
THRESHOLD button. The minutes can also be corrected
by short pressing of the THRESHOLD button. 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.
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