W&T 57728, Web-Thermometer Air Quality
This product has been discontinued by the manufacturer. The replacement is the 57721
Monitor air quality
On-demand ventilation control in office buildings, schools, education centers and sports facilities often involves the measurement of CO2 levels. However, a drawback of CO2 measurement is that odors caused by VOC are not detected, as they have only a slight effect on the CO2 measurements. Even though there is an actual ventilation need, this condition is not detected using traditional technology. With this VOC measuring instrument, the room air quality can be determined based on human perception.
More information on VOC can be found here
