For many years, the barometer has been used to predict rapidly changing weather on the water. It is a reliable instrument that no nautical mariner should be without. This quality 7" diameter barometer is a working porthole made of solid brass with lacquer coating and three mounting holes, brass screws included. It features a bezel height of 2" and weighs approximately 3 lbs. We carry rosewood clock plaques and brass engraving name plates to personalize it. There is a 3 year manufacturer's warranty. We also offer a 30-day money-back guarantee if you are not completely satisfied with the instrument. Instructions for use and setting will accompany the instrument.