GASCO 34LS-314A Calibration Gas, Carbon Monoxide 60 PPM, Methane 1.45% = (58% LEL) Pentane simulant, Oxygen 15%, Balance Nitrogen contained in a 34 Liter Disposable Steel Cylinder, For Use with Any and All Gas Detectors, Cylinder Connection CGA 600, Calibration Certificate NIST, Made in the USA

Order 34LS-314a, from Cal Gas Direct Incorporated, GASCO Calibration Gas is Made in the USA, Easy Ordering, Excellent Customer Service, Largest Selection in the USA