Carbon Monoxide/Carbon Dioxide IAQ Datalogger Meter - (GSM450)The Triplett Model GSM450 Carbon Monoxide Carbon Dioxide IAQ DatMeter measures CO, CO2, Temperature, Humidity, Wet Bulb and Dew Point and can be used to measure air quality in office buildings, schools, exhibition halls, shopping malls, malogger eeting rooms, fitness centers, restaurants and other public places. Read More > DESCRIPTION The Triplett Model GSM450 Carbon Monoxide Carbon Dioxide IAQ Datalogger Meter measures CO, CO2, Temperature,