ECOTEST DKG-21 M Operating Manual page 61

Press the MODE button once again and hold it
pressed for 4 s to switch the dosimeter off. If the
dosimeter is switched on in the stand-alone mode, i.e.
no data exchange with the PC is done, it will switch off.
If during switching it on data exchange between the
dosimeter and the PC took place, an attempt to switch
the dosimeter off would only activate the infrared port
for 15 s.
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