Desktop CO2 Logger/Monitor - (GSM220)The Triplett Model GSM220 Desktop CO2 Logger 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 GSM220 Desktop CO2 Logger Monitor simultaneously displays CO2, Temperature, Relative Humidity, Time and Date and