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Gas to be measured Chemical Formula Detector Tube Name (*) Measuring Range(ppm)
Water vapour H2O 177SA WATER VAPOUR 10 1.7-33.8mg/l
    177U WATER VAPOUR 10 0.05-2.0mg/l
    177UL WATER VAPOUR 10 3-80LB/MMCF
    177UR WATER VAPOUR 10 2-12LB/MMCF
    603SPA WATER VAPOUR(USE WITH P-41R) 10 20-160mg/m3
Xylene C6H4(CH3)2 143SA XYLENE 10 5-1,000ppm
    143SB XYLENE 10 5-200ppm
    721 TOLUENE(USE WITH AIR SAMPLER) (+) 10 0.1-1.4ppm
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