To calibrate indoor or outdoor temperature, in the Set Mode with indoor or outdoor temperature flashing,
press the + key or MIN/MAX key to increase or decrease the temperature setting (in increments of 0.1
degC or 0.18 degF) to match the calibrated or known temperature source.
5.2.2 Setting Calibrated Humidity
The display console allows you to calibrate both the indoor and outdoor humidity. Humidity is a difficult
parameter to measure accurately and drifts over time. The calibration feature allows you to zero out this
error. To calibrate humidity, you will need an accurate source, such as a sling psychrometer or
Humidipaks One Step Calibration kit.
To calibrate indoor humidity, in the Set Mode with indoor humidity flashing, press the + key or MIN/MAX
key to increase or decrease the humidity setting (in increments of 1%) to match the calibrated or known
humidity source. To return the indoor humidity to the measured value, press and hold the SET key for 3
seconds and the humidity will return to the uncalibrated value.
To calibrate outdoor humidity, in the Set Mode with outdoor humidity flashing, press the + key or
MIN/MAX key to increase or decrease the humidity setting (in increments of 1%) to match the calibrated
or known humidity source. To return the outdoor humidity to the measured value, press and hold the SET
key for 3 seconds and the humidity will return to the uncalibrated value.
Note: The remote (outdoor) thermo-hygrometer will always display the measured humidity level and not
the calibrated humidity level. Only the console will show the calibrated value.
Note: The dew point calculation is based on the calibrated humidity level.
5.2.3 Setting Barometric Pressure
The display console displays two different pressures: absolute (measured) and relative (corrected to
sea-level).
To compare pressure conditions from one location to another, meteorologists correct pressure to
sea-level conditions. Because the air pressure decreases as you rise in altitude, the sea-level corrected
pressure (the pressure your location would be at if located at sea-level) is generally higher than your
measured pressure.
Thus, your absolute pressure may read 28.62 inHg (969 mb) at an altitude of 1000 feet (305 m), but the
relative pressure is 30.00 inHg (1016 mb).
The standard sea-level pressure is 29.92 in Hg (1013 mb). This is the average sea-level pressure around
the world. Relative pressure measurements greater than 29.92 inHg (1013 mb) are considered high
pressure and relative pressure measurements less than 29.92 inHg are considered low pressure.
To determine the relative pressure for your location, locate an official reporting station near you (the
internet is the best source for real time barometer conditions, such as Weather.com or
Wunderground.com), and set your weather station to match the official reporting station.
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