Ambient Weather WS-228TBH 9" Brushed Aluminum Contemporary Barometer with Temperature and Humidity, Metallic Radiant Blue The USA version of this instrument displays barometric pressure in imperial units (inHg) and includes a reference needle for tracking changes. The 9" brushed aluminum bezel and radiant blue dial is both bold and handsome. It's contemporary design is at home in the office, board room or the modern living room setting. The barometer is equipped with a set screw for easy calibration. The back includes a hook for easy hanging. A reference needle tracks changes in barometric pressure. The barometer allows for sea-level calibration up to 3,000 feet. Do not purchase this barometer is you live above 3,000'.