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This describes a scope's ability to remain completely dry on the inside when exposed to moisture or total submersion in water. ZEISS scopes are sealed with O-ring and are filled with 100% arid nitrogen, which also resists all forms of moisture. ZEISS scopes are tested in accordance with German DIN ISO 14135 and ISO 9022-8, which guarantees that the product will not fog or leak in any way.
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