Three panes along the bottom of the display are "mapped" to the keys. These change as menus
change, but at all times the left pane corresponds to the [Y/+] key, the center pane corresponds
to the [MODE] key, and the right pane corresponds to the [N/-] key. Here are three examples of
different menus with the relationships of the keys clearly shown:
MiniRAE 3000+, ppbRAE 3000+, UltraRAE 3000+
Relationship of buttons to control functions
MiniRAE Lite+
Handheld PID Monitors
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User Manual