Air Quality Carbon Dioxide Monitor - (GSM200)The Triplett Model GSM200 Desktop Indoor Air Quality CO2 Monitor simultaneously displays CO2, Temperature, Relative Humidity, Time and Date and can be used to measure air quality in office buildings, schools, exhibition halls, shopping malls, meeting rooms, fitness centers, restaurants and other public places. Read More > DESCRIPTION The Triplett Model GSM200 Desktop Indoor Air Quality CO2 Monitor simultaneously displays CO2, Temperature, Relative