TFA Dostmann KlimaLogg Pro Mode D'emploi page 38

Note that through the main reset also all recorded data will deleted. If
necessary, please ensure that there is no relevant data on the
KlimaLogg Pro that has not yet been retrieved or transferred to the PC.
If the device shows a malfunction, we recommend that you firstly check
the batteries and try a normal reboot of the unit. If this does not help, we
recommend that you do the main reset.
TRANSMITTERS:
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If you do not know for certain which transmitter is entered for which
channel in your individual channel designations, you can call up this
Note:
Note: