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Gasco 58L-437 58 Liter 50 PPM Carbon Monoxide, 50% LEL Propane, 25 PPM Hydrogen Sulfide, 18.0% Oxygen Calibration Gas, Nitrogen, 1 Each Fire Blankets Forensics Source Puritan Cap-Shure™ ProtectiveGasco 58L 437 58 Liter 50 PPM Carbon Monoxide, 50% LEL Propane, 25 PPM Hydrogen Sulfide, 18. 0% Oxygen Calibration Gas, Nitrogen, 1 Each The Gasco 58L 437 58 Liter 50 PPM Carbon Monoxide, 50% LEL Propane, 25 PPM Hydrogen Sulfide, 18. 0% Oxygen Calibration Gas, Nitrogen is a precision calibration gas used to calibrate sensors in gas detection equipment for environmental emissions monitoring, industrial hygiene monitors, and trace impurity analyzers. It