DAVIS Weather Monitor II (7440, 7440CS) - Manual (Page 33)

Dew Point
Weather Monitor II Page 29
D
EW
P
OINT
Dew point is a measure of the absolute amount of water vapor in the air
expressed as a temperature reading. The temperature reading represents the
temperature at which water condenses from the air. If temperature and dew
point are the same, the result will be fog and/or dew. Dew point can be dis-
played in either ˚F or ˚C, in increments of 1˚.
The Weather Monitor II also records high and low dew points, and has a spe-
cial dew point alarm to alert you when temperature comes within 2˚F (1˚C) of
dew point.
Because dew point is dependent on water vapor (humidity), if you do not have
the External Temperature/Humidity Sensor, all dew point displays will appear
with a series of dashes in place of a dew point reading.
See the booklet included with the External Temperature/Humidity Sensor for
instructions on displaying dew point.