GASCO EB-1 Zero Air Calibration Gas Balance Air (20.9 % Oxygen balance Nitrogen) contained in a ecobump aluminum cylinder, Material: Aluminum Alloy, Pressure: 1200 PSI, Dimensions: 4" x 2", Water Capacity: 0.066 Liters, Multiple Bumps: Approximately 250 bumps per cylinder, Free shipping No Haz-Mat, Certification NIST (ecobump regulator sold separately), Made in USA
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