GASCO 34L-175-25, 25 ppm Sulfur Dioxide, Balance Nitrogen, Calibration gas, 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 SO2 Calibration Gas also known as SO2 Cal Gas, is used for the calibration and maintenance of gas detectors. All of our Calibration Gas Cylinders ship with a COA (Certificate Of Analysis). Our calibration gas is NIST Traceable, Made in the USA, and produced using an ISO9001:2008 certified process