 | | 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 58 390 80 and ISO 9022, which guarantees that the product will not fog or leak in any way. |  |  Dealer Locator |