Lutron GCH-2018 CO2 Meter + Humidity/Temp

CO2 METER, + Humidity, Temperature.
Model : GCH-2018
* Function : CO2 ( Carbon dioxide )
Humidity, Dew point, Temp. (°C/°F)
* CO2 range : 0 to 4,000 ppm, max., 6000 ppm typically.
* Humidity range : 10 to 95 % RH.
* CO2 sensor : NDIR, long term reliability.
* CO2 with alarm setting.
* Data hold, Record ( Max., Min. ).
* RS232/USB computer interface .
* Optional data Acquisition softwares : SW-U801-WIN, SW-E802.
* Optional USB cable, USB-01.