Vaisala HM40 - Manual (Page 23)

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HM40 can store up to 40 tagged points. If a new
tagged point is stored when the memory is full, the
oldest tagged point is silently deleted to make
room for the new point.
Graph Duration
In the Graph duration screen, you
can select the timescale of the
Graph view. The shortest selectable
timescale is 1.5 minutes, the longest
32 hours.
You can also select Autoscale,
which means that the timescale will
automatically adjust to show all of
the measurement data in memory,
up to the maximum of
32 h.
Settings
Opens the Settings menu. The
menu options are described in
section Settings Submenu on page
24.