The Extech EA80 indoor air quality meter checks carbon dioxide (CO2) concentrations while simultaneously measuring temperature, humidity, dew point, and wet bulb. It features a maintenance-free dual wavelength NDIR (non-dispersive infrared) CO2 sensor.

CO2 measurement range 0-6000ppm; temperature -4 to 140°F (-20 to 60°C); humidity 10-95% RH. Data logging capabilities include continuous logging (20,000 sets) or manual logging (99 sets). Other features: data hold, max/min with time stamp and alarm, auto power off, easy calibration in fresh air. Applications: schools, office buildings, greenhouses, hospitals, and anywhere high CO2 levels are generated.