Fischer Instruments 15-01 Starinless Steel 4" Barometer Barometer with stainless steel housing. The USA version of this instrument displays the metric units (mbar) on the inner scale and imperial units (inHg) on the outer scale. The barometer features a bezel made of stainless steel, with a mineral glass cover. Note: Operates to about 3,000 feet altitude (do not order if you live above 3,000 feet). The Fischer factory for precision instruments was founded in 1945 by aircraft engineer Kurt Fischer, in a small village in the Erzgebirge called Drebach.