Hach-Lange DR 3900 User Manual - Manual (Page 126)

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Expanded programs
Data transfer is either via memory card or network (LAN). For a
detailed description, refer to the Link2SC operating instructions.
6.9.7 Website DR 3900
Use this function to call up an Internet website on an existing
network connection. Current software updates, as well as
documentation and information on the DR 3900 can be found
here.
The labeling of the key varies from model to model and may vary
from the illustration in these instructions.