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)
Octane CH3(CH2)6CH3	101	Gasoline(Petrol)	0.036-0.72%	1	3	-		300
	105	Hydrocarbons (HigherClass)	200-3000	1	3	-
			100-200	2
Olefines	100A	LPG	0.34-13.6mg/l	1	3	-		-
Oxygen O2	31B	Oxygen	6-24%	1/2	3	@		-
			3-6%	1
Ozone O3	18M	Ozone	200-400	1/2	3	-		0.08
			20-200	1
			4-20	2-5
	18L	Ozone	0.6-3	1	3	-
			0.05-0.6	5
			0.025-0.05	10

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