The barometer portion of this combination instrument
consists of a 64”-long U-shaped tube filled with a red
non-toxic silicon fluid and gas. Adjacent to the barometer
tube is a 32”-long blue methyl-alcohol thermometer. A
truly unique scale slides between the thermometer and
barometer and compensates for thermal expansion of
the silicon fluid and glass tubing due to changes in the
room temperature. This allows for accurate measurement
of the air pressure. In addition, the barometer’s scale is
four times larger than a standard mercury scale, making
it much easier to read. The glass tubes for both the
barometer and the thermometer mount on a durable clear
acrylic base. The unit also comes with a calibration kit so
you can adjust it for accurate readings if you live at an
altitude above sea level. Thermometer scale: 32–122°F
/0–51°C; barometer scale: 28.80–31.00” Hg/975–1050
hPa. Size: 36 1/2”L x 5 3/4”W.