The precision brass porthole barometer measures 5.25"Dia x 2"D. This german precision brass porthole barometer comes in a solid brass tarnish proof case with beveled glass. It’s movements are calibrated for altitudes to 3500’ above sea level. It will add a definite nautical touch to whatever room it is placed in and is a must have for those who appreciate high quality nautical decor. It will accurately and precisely predict weather conditions coming to your area.