ANTIQUE porcelain/metal NEGRETTI & ZAMBRA HYGROMETER. The item “ANTIQUE porcelain NEGRETTI & ZAMBRA HYGROMETER london baramoter thermometer sign” is in sale since Wednesday, November 18, 2015. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “hamason10″ and is located in Hixson, Tennessee. This item can be shipped worldwide.