GASCO 463 Calibration Gas Carbon Monoxide 100 PPM, Methane 50% LEL, Hydrogen Sulfide 25 PPM, Oxygen 19%, Balance Nitrogen contained in a 10 Liter Aluminum Cylinder, For Use with Any and All Gas Detectors, Cylinder connection Built in Aerosol Trigger, Calibration Certificate NIST, Made in the USA
This is for Bump Testing