ECOTEST DKG-21 Operating Manual page 14

3.2.25 The dosimeter sends audio and light signals if the programmed
DER or DE threshold level is exceeded.
3.2.25.1 The dosimeter sends an interrupted audio signal when 90 % of
the programmed threshold level of DE is reached. Press any button to
switch this audio signaling off.
3.2.26 DER and DE values as well as DER and DE threshold level
values alternately appear on the digital liquid crystal display (dLCD).
3.2.26.1 The dosimeter displays the statistical error of DER
measurement result. Indication is performed by a blinking or steady
decimal point in the DER measurement mode.
3.2.27 The dosimeter provides an option to charge the storage battery
from an external charger.
3.2.27.1 The dosimeter displays the process of charging the storage
battery and its completion. Two-color LED is used for indication.
3.2.27.2 Low battery is charged within not more than 5 hours.
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