Gas or Vapour to be Measured Chemical Formula	Réf tube	Gastec Tube No. & Name	Measuring Range (ppm)	No.of Pump Strokes	Shelf Life (year)	Note		TLV- TWA,C (ACGIH) (ppm)
Gasoline (Petrol) CnHm	101	Gasoline (Petrol)	0.6-1.2%	1/2	3	-		300
			0.03-0.6%	1
			0.015-0.03%	2
	101L	Gasoline (Petrol)	1000-2000	1	3	-
			30-1000	2
	1M	Carbon monoxide	0.1-2%	1	3	-

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