I do not know how or if the item works. It is a cool piece of equipment! Measures 2 inches across and 3/4 inch deep. Thank you and God Bless! The item “1931 Negretti and Zambra Barometer Altimeter” is in sale since Saturday, April 25, 2015. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “crogers500″ and is located in Smyrna, Tennessee. This item can be shipped to United States.
- Maker: Negretti & Zambra
- Original/Reproduction: Original