ECOTEST DKG-21 M Operating Manual page 46

4.2.2.2 Open the battery compartment and make sure
the battery is inserted, connections are reliable, and
there is no leakage of salts after durable storage of the
dosimeter. In case there is a salt leakage, remove the
battery. Clean it, if possible, or replace, if not. Insert the
battery and close the battery compartment.
4.2.2.3 Please replace the battery if there are signs of
the low battery on the LCD - three to four blinking
segments of the battery symbol in the top right corner of
the LCD when the dosimeter is switches on irrespective
of the selected mode. When completely discharged, all
four segments of symbol are blinking and short beeps
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