Condensation accumulates on the parts.
It is O.K. to use the unit in cold. However, when the unit is brought from the cold into a warm environment, it has to warm up for up to 2 hours (not minutes!). Only then it is allowed to turn it ON again.
Visibility decreases and / or disappears.
Bright light sources (moon, projectors or headlights) may cause visibility to degrade or even completely disappear. Move the device away from the light source immediately. The image should be restored in within 2 minutes. Poor atmospheric conditions such as fog, haze, or extremely dark environments will decrease the visibility distance of the unit.
Reticle is absent or weak.
Check the batteries.
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