ECOTEST DKG-21 Operating Manual page 26

Using the DCC the processor normalizes the duration of "dead time" at
each actuation of the counter with high accuracy, which allows considering
it in the applied algorithm of pulse flow processing for linearization of
counting response and expansion of the dynamic range of the counter.
Choose the respective operating modes of the dosimeter by successive
short presses of the MODE button. The processor each time initiates the
display of information correspondence signs on the dLCD in the form of
appropriate symbols. By clicking THRESHOLD in the corresponding
measurement mode, the processor switches to the mode of programming of
sound and light alarm actuation threshold values or adjustment of clock or
alarm clock time setting.
Turn off the dosimeter at its stand-alone use by pressing and holding
down the MODE button for more than 4 seconds.
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