Porthole Barometer can be used to predict rapidly changing weather on the sea's and land. It is a instrument that no mariner should be without. This quality 5" diameter barometer is a working porthole made of solid brass with lacquer coating and three mounting holes, screws included. Excellent choice for boats, sailbaots and yachts. It features a bezel height of 2" with a white dial 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.