The Lutron MCH-383SD is a very economical way to obtain long term data on these variables, and if desired - make a permanent display. Recorder with real time data recorder, save the measuring data along the time information (year, month, date, minute, second) into the SD memory card and can be download to the Excel, extra software is no need.
CO2 range : 0 to 4000 ppm.
Humidity : 10 to 90 %RH.
Temperature : 0 to 50.0 oC, oC/oF.
DC 1.5V (UM-4, AAA) battery x 6 PCs (clock backup battery) and
DC 9V adapter in (for meter and probe).
RS232/USB computer interface.
Size : 132 x 80 x 32 mm.