The RKI Calibration 4-Gas Mixture in an aluminum 34 liter cylinder. The mixture is 25 ppm H2S/50 ppm CO/50 percent LEL CH4/12 percent 02 in N2. The Calibration 4-Gas Mixture is for use with the RKI SDM2009 Calibration Station for GX-2009 and the RKI SDM-2012 Calibration Station for GX-2012.
Note: calibration gas is not returnable. Please check your selection carefully before ordering.