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)
Xylene C6H4(CH3)2	123	Xylene	250-500	1/2	3	-		100
			10-250	1
			5-10	2
	100A	LPG	0.1-1.2%	2	3	-
	122L	Toluene	100-200	1	3	-
			4-100	2
			2-4	4

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