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4000 Weems & Plath Electronic Marine Barometer This professional grade Electronic Barometer was designed specifically for the mariner. Not only does it show current pressure on the large display, it also displays historical information on a much more expanded scale than most electronic barometers. For example, someone just coming on watch can see an expanded history of any changes that occurred over the last 6 hours in 30 minute increments. Weems & Plath Â® Electronic Marine Barometer In addition the Weems & Plath Electronic Marine Barometer has the following features: Accurately detects pressure changes to within +/- 0.5hPa. Alarm feature to signal abrupt changes in pressure. Gale warning system. Continuous display of current pressure. Continuous display of time and/or temperature. Backlighting for night use Can be free standing or bulkhead mounted. Weight: 12 oz. Operates on 2 AAA batteries (included) average battery life - 1 year. Dimensions: 7-3/8" H x 7-1/2" W x 1-1/4" D.