Fischer Instruments 1508B-01 5" Stainless Steel Open Face Barometer Open Face Barometer with stainless steel housing. The instrument is for indoor and outdoor use. The barometer can be combined with the 1508U-01 quartz clock and 1508TH-01 thermo-hygrometer. The USA version of this instrument displays the metric units (mbar) on the inner scale and imperial units (inHg) on the outer scale. The open face barometer features a bezel made of stainless steel, with a mineral glass cover.