Leupold GX-5i Operating Instructions Manual page 20

MANUALLY INPUT THE DAY OF PLAY TEMPERATURE:
1) Press POWER to activate the rangefinder.
2) Press and hold MODE for at least 1 second and release to enter the
Quick Set Menu.
3) Verify that TGR is turned on; if TGR is not activated, you will not be able
to enter the current temperature, see "To Activate TGR:" above.
4) Press and release MODE until temperature is displayed.
5) While the temperature is flashing, press and release POWER to change
the current temperature setting to match the current conditions. Each
depression of POWER will increase the temperature setting by 5
degrees until 120 degrees F (50 degrees C) has been reached, at
which time the setting will return to 30 degrees F (0 degrees C) and
begin increasing again.
6) To save the changes and return to ranging mode, let the unit sit idle
for at least 30 seconds until an automatic power-down occurs, or simply
press and hold MODE for at least 2 seconds. To continue through the
Quick Set Menu and manipulate another feature, press and release
MODE until the appropriate icon is displayed.
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