Newcon Optik DAY/NIGHT VISION SCOPE NVS 10MG - Manual (Page 22)

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It’s allowed to store the units in transportation case at
temperatures up to 70C (158 F) for not more than 10 hours.
It is unacceptable to place the NVS 10MGs on the floor,
near stoves and windows that let through direct sunrays.
Presence of acid and alkaline vapour, as well as of other
aggressive admixtures in the air is unacceptable.
After a 4-year period of storage, it is necessary to perform
thorough check-up of the NVS 10MGs’ functionality.