TES 5322 PM2.5 Air Quality Monitor (VOCs-Volatile organic compounds) Fine particulate matter (PM2.5) measurement / VOCs time weighted average reading Mix gases (VOCs-Volatile organic compounds) measurement.High sensitivity to H2, C2H5OH, C4H10, CO and CH4. Monitoring air pollutant source from dust, petrochemical industry, steel-making plant, thermal power plant, restaurant, smoke, burning plants, driving automobiles. The meter is a real-time air quality monitor instrument used to monitor the concentration of PM2.5, humidity and temperature in the indoor environment. USB Interface/Auto data logger function.