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What is does it mean when a Binocular is Nitrogen Purged?

April 26, 2017binocular mean nitrogen purged

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What is does it mean when a Binocular is Nitrogen Purged?

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Nitrogen purging renders a binocular water proof and fog proof. Nitrogen purged binoculars can be completely submerged in water without being damaged. It also guards against fogging in the interior of the binocular due to extreme enviromental changes in tempurature and humidity.