:
				
				
				- 
				3 independent CO2, humidity and temperature 
				
				  
				sensors. 
				
				- 
				User operated CO2 calibration. 
				
				- 
				Datalogging up to 50,000 records with fast USB 
				
				  
				download.
				
				- 
				Internal back-up battery to maintain the data of 
				
				  
				Date/Time.
				
				- 
				Power management IC to increase battery efficiency.
				
				- 
				Easy-to-use PC software or parameter setting and 
				
				  
				data analysis.
				
				- 
				Building in audio CI2 buzzer/alarm.