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DEACTIVATE TEMPERATURE ALARM: Press and release the TEMP ALERT button 3 times to deactivate all
temperature alarms. The alert icons will disappear.
Temperature Trend Indicators
The indoor and outdoor temperature trend indicators will update every 30 minutes or less. These trends
represent temperature changes over the past three hours.
Temperature rose more than 2°F /1°C in the past three hours
Temperature has not changed more than 2°F /1°C in the past three hours
Temperature fell more than 2°F /1°C in the past three hours
The temperature trend indicators are shown next to the indoor temperature and outdoor temperature
readings.
Pressure Readings
Absolute Barometric Pressure Number
Barometric pressure is read by the forecast station. The numeric pressure value adjusts automatically as the
forecast station reads changes in air pressure. Since this number is absolute pressure, it may not be the same
as a local reporting station that reads in relative pressure.
Note: The number cannot be calibrated.
Absolute Pressure is measured in a vacuum without the influences of terrain, weather, water, foliage and
elevation. The air pressure it would be consistent at every elevation and decrease as it went higher.
Relative Pressure is a combination of air pressure and altitude. Relative air pressure will make readings in
local areas relative to each other to allow for proper forecasting.
Pressure Unit of Measurement (InHg or hPa)
Hold the HISTORY button for 5 seconds to switch from InHg (inches or mercury) or hPa (Hectopascal) for the
numeric pressure display and the pressure graph.
Inches of Mercury is common for weather reports and aviation in the United States.
Hectopascal is equivalent to millibar and commonly used to measure atmospheric pressure outside the
United States.
Pressure History
Press and release the HISTORY button to view the past 12-hours of numeric pressure
history.
In the small box to the right of the numeric pressure a number from 0 to -12 will
appear.
0 is current pressure. -1 through -12 reflects the history in one-hour increments.
Note: The history graph and forecast icons will not change when you view pressure history.
Pressure History Graph
The bar chart indicates the air pressure history trend over the last 12 hours in 5 steps, 0h, -1h, -2h, -3h, -6h & -
12h.
The columns represent the change in "InHg" or "hPa" readings at specific
times.
The "0" in the middle of this scale is equal to the current pressure and each bar
represents how high or low in InHg or hPa the past pressure was compared to the current pressure.
Model: 308-1451
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