Petro Marine
Model Gasco 421 -100 Ppm Carbon Monoxide 50% Lel Methane 25 Ppm Hydrogen Sulfide 18% Oxygen In Nitrogen 58 Liter Cylinder
FromPetro Marine
100 PPM Carbon Monoxide 2.5% CH4 (50% LEL) Methane 25 PPM Hydrogen Sulfide 18% Oxygen in Nitrogen, Contained in an Aluminum Cylinder, Cylinder connection C-10 5/8"-18 UNF, Calibration Certificate NIST, Made in the USA