The Amprobe CO2-100 carbon dioxide meter is useful for obtaining factual data on why a mild headache occurs etc. A dew point solves many problems with perceived humidity and comfort. Although the product is a bit pricey, it is fully functional and has a long 4xAA battery life. The owner must keep in mind that airflow is required through the sensor at the top. Otherwise, the body temperature of the probe may affect the measured temperature reading. The owner may need to create (sweep) an airflow when not measuring the temperature in the duct or at the outlet of the duct (home/car/industrial).
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