جهاز قياس نسبة الغاز فى الجو توتال تولز TETGA23 
TOTAL Digital gas indicators (TETGA23) 
SPECIFICATIONS
	
		
			
Range:50~1000ppm(methane)
		
		
			
Detecting gas:Combustible gas
		
		
			
Response sensitivity: <50PPM
		
		
			
Response time: <=500PPM: 5 seconds; >=500PPM: 2 seconds
		
		
			
Warm-up time: about 30 seconds
		
		
			
Alarm mode: analog display and wind chime
		
		
			
Use environment: 0-50℃/20-80%RH
		
		
			
Storage environment: -10~60℃/20-80%RH
		
		
			
Power supply: 2x1.5V AAA batteries