Leupold FX-3 Owner's Manual page 34

To illuminate the reticle:
1 . grasp the illumination dial located at the top of the
eyepiece shell .
2 . Turn the dial clockwise from the oFF position to the first
number indicated on the dial .
3 . View the target through the scope to determine if the reticle is
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bright enough to stand out clearly against the target .
4 . If more illumination is required, continue turning the dial
clockwise until the reticle is clearly visible against the target .
To preserve the life of the battery, always remember to turn the
illumination dial to the oFF position when the scope is not in use .
For prolonged storage, remove the battery .
If the reticle fails to illuminate or appears dim even on the highest
illumination setting, it is necessary to change the battery .
WARNINg: Always check to ensure that the firearm is unloaded
before changing the battery in the scope .