New 3 1/2" Barometers (IVORY) Each barometer features a gold finish metal bezel and is fully adjustable. Our barometers have a gold color "constant" hand with a front adjustment so you can when desired to mark the current conditions, so that you can clearly see on the black indicator hand which way the barometric pressure is moving. This is the essence of using a barometer, which is watching the changing conditions, which is an accurate indicator of the weather conditions to come. Our barometers have "slotted" brass screw on the back which allows you to adjust your barometer to your local conditions, prior to installation. Please remember that our barometers will operate accurately up to altitudes of 5,000 feet. Popular 2-3/8" Mounting Hole Size Versatile Soft Gasket Mounting System Gold Finish Metal Bezels Choice Of Ivory Or Gold Dials Dimensions: Overall thickness: 1-1/4" Mounting Depth: 3/4" Bezel/Lens Height: 5/16"