TPI 1010 Indoor Air Quality IAQ Meter features Calculate percent outside air to maintain acceptable CO2 levels in buildings and work spaces, Measure and display Carbon Dioxde(CO2) and Carbon Monoxide, Measure ambient air temperature, Measure relative humidity, dew, point and wet bulb, Log up to 4,000 readings in 1 second to 23 hour 59 minutes intervals, Download to a computer using the A368 USB cable.