| Description | Carbon dioxide sensor, CO2 concentration (max. 9999 ppm) | Wireless Data logger with Illuminance/UV sensor, 4.9MB on-board memory, micro-SD memory slot, micro-B USB PC interface, LCD display | GL840 DIN Rail Mounting Kit | Wireless Data logger with Acceleration/Temp. sensor, 4.9MB on-board memory, micro-SD memory slot, micro-B USB PC interface, LCD display | GL840 input terminal (Multi-input type) | Data logger with GS-CO2 Carbon dioxide sensor, 4.9MB on-board memory, micro-SD memory slot, micro-B USB PC interface, LCD display | 
| Additional information | 
			
			| Weight | 
			0.5 lbs | 
		 
			
			| Dimensions | 
			6 × 8 × 4 in | 
		 
	 
 | 
			
			| Weight | 
			2 lbs | 
		 
			
			| Dimensions | 
			6 × 8 × 4 in | 
		 
	 
 | 
			
			| Weight | 
			2 lbs | 
		 
			
			| Dimensions | 
			6 × 8 × 4 in | 
		 
	 
 | 
			
			| Weight | 
			2 lbs | 
		 
			
			| Dimensions | 
			6 × 8 × 4 in | 
		 
	 
 | 
			
			| Weight | 
			1 lbs | 
		 
			
			| Dimensions | 
			6 × 8 × 4 in | 
		 
	 
 | 
			
			| Weight | 
			1 lbs | 
		 
			
			| Dimensions | 
			6 × 8 × 4 in | 
		 
	 
 |