UP: The function of the UP key varies depending on the interface, e.g. moving
the displayed element upwards, moving the selected element upwards, changing
digits, etc;
DOWN: The function of the DOWN key varies depending on the interface, e.g.
moving the displayed element downwards, moving the selected element down-
wards, changing digits, etc;
LEFT: The function of the LEFT key varies depending on the interface, e.g.
switching the monitoring interface, e.g. moving the cursor to the left, exiting the
current menu and returning to the previous menu, etc;
RIGHT: The function of the RIGHT key varies depending on the interface, e.g.
switching the monitoring interface, moving the cursor to the right, calling up the
next menu, etc.
240×160 dot-matrix LCD; able to display three monitoring parameters or six sub-
menu items simultaneously
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