610-0002-000 REA equivalent by GASCO Calibration Gas, 20.9% O2 in a 34 Liter Aluminum Cylinder, For Use with Any and All Gas Detectors, Cylinder connection C-10 5/8"-18 UNF, Calibration Certificate NIST, Made in the USA

GASCO Zero Air (20.9 % Oxygen balance Nitrogen) Contains Less than 2 PPM H20, 0.1 PPM THC, 1 PPM CO2, and 1 PPM CO, Certification NIST, Made in USA

Our Precision Calibration Gas also known as Cal Gas, is used for the Calibration and Maintenance of Gas Detectors and Sensors. All of our GASCO Calibration Gas Cylinders ship with a Certificate of Analysis (COA). GASCO Calibration Gas meets or exceeds the requirements of the Original Gas Detection Equipment Manufactures Specifications. GASCO Calibration Gas is National Institute of Standards and Technology (NIST) Traceable, GASCO Calibration Gas is Made in the USA, and produced using an ISO 9001:2008 certified process.