ABOUT BAROMETRIC PRESSURE AND ALTITUDE ADJUSTMENTS
The Kestrel Meter measures “station” pressure, the actual air pressure in the measurement location, and uses this value to calculate barometric pressure and altitude. Station pressure changes in response to two things—changes in altitude and changes in the atmosphere.
Because the Kestrel Meter is constantly changing location and altitude, it is important to enter adjustments or “references” when accurate pressure and altitude readings are needed.
Barometric pressure is station pressure corrected to sea level. In order to make the correction, the Kestrel Meter needs an accurate reference altitude. Altitude is the height above sea level. In order to correctly calculate altitude, the unit needs an accurate barometric pressure reference, also known as an “altimeter setting”. Fortunately, you only need to know ONE of these values (current barometric pressure or current altitude) in order to set your Kestrel Meter up to show accurate readings.
Starting with a known altitude for your location
You can obtain your altitude from a topographical map or local landmark. Google Earth is an excellent free program that provides the exact altitude for any given address: Google Earth
Set this value as your reference altitude on the BARO screen to determine your barometric pressure: simultaneously press "< and >" buttons to adjust the reference altitude.
Press "< or >" to adjust the reference altitude, or hold "< or >" to adjust the value quickly. You will notice that the barometric pressure will change with changes in the reference altitude.
Simultaneously press "< and >" to exit the reference altitude adjustment. Again, allow the Kestrel Meter to stabilize, then enter the value from the BARO screen as your reference pressure on the ALTITUDE screen by following the same procedure. Both readings are now accurate."