This state-of-the-art barometer is waterproof, and functions extremely well in the punishing saltwater environment. The low glare, satin black case of each precision instrument is constructed of solid aluminum that is color anodized and sealed so that the finish will not peel, bubble, or tarnish.
The glass crystal sits in a double O-ring seat for vibration, impact, and thermal expansion protection. The anodized aluminum dial is laser engraved. The durable movable markers, for tracking changes in pressure, are made of U.V. stabilized polycarbonate. All fasteners are stainless steel.
A hydrophobic filter allows air to pass yet resists water. The filter will easily stop the entrance of water due to continuous spray and, because of its unique construction, it is waterproof to a depth of 3 feet for 30 minutes.
This barometer includes a patented "high sensitivity" all metal aneroid movement and has an expanded scale so that the needle noticeably moves as weather conditions change. The scale ranges from 28.5" to 31.5" instead of the traditional 27.5" to 31.5" Hg. It also can be read in millibars.