Vaisala HM40 - Manual (Page 29)

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Battery
Use the Battery setting to tell the meter what kind of
batteries are installed. This will help to scale the battery
indicator correctly. The options are:
- Alkaline
- Rechargeable
Navigation
Navigation setting affects the behavior of arrow buttons
in the measurement view:
- Normal: Up arrow moves parameter selector left, down
arrow moves it right
- Inverted: Reverses the direction
Rounding
Rounding setting affects the number of decimal places
that are used to show the measurements:
- On: Measured values are rounded to one decimal place.
- Off: Measured values are shown with two decimal
places.