Takes temp, humidity, wet bulb and CO2 readings. Must have calibration gas to calibrate the CO2 readings. It is a data logger as well.
I aquired this and personaly don’t need it but seems to work fine. Comes with CD hard case stand and a/c adapter.
These are not cheap by any means. The newest model are over 2 grand.
If you want it shoot me a price. I figured around $400.00