4-Gas – Carbon Monoxide / Carbon Dioxide / Methane / Oxygen / Nitrogen Calibration Gas Mixtures

Select an option... Carbon Monoxide 50 ppm / Carbon Dioxide 5,000 ppm / Methane 2.5% (50% LEL) / Oxygen 20.9% / Nitrogen Carbon Monoxide 50 ppm / Carbon Dioxide 2.5% / Methane 2.5% (50% LEL) / Oxygen 12% / Nitrogen