The Amphibious Scopes from Vixen are designed for underwater observation and investigation tasks that involve water tanks, boat hulls, bottom structures, fishing areas, sea farms, or any other aqueous environment. The scopes can also be used for terrestrial periscop type viewing. Features: Waterproof Construction Use on land or in water Soft Carry Bag Included Periscope for land or underwater use. Available in 25mm or 35mm objective lens diameter. Waterproof contruction. Soft carry bag included.