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100 ppm / Air
50% LEL (2.5% by Volume) / Air
29% LEL / CO 60 ppm / O2 15% / N2
50% LEL / CO 50 ppm / Air
50% LEL / CO 50 ppm / O2 19% / N2
50% LEL / CO 50 ppm / O2 12% / N2
50% by Volume / CO2 35% by Volume / N2
