Drager Standard 4-Gas Calibration/Bump Mixture containing 50% LEL CH₄, 100 ppm CO, 25 ppm H₂S, 17% Vol. O₂ - 4594655 - 1/CS bottle Approvals: according to EN 403:2004 W1092 Keyed:The Same Cotton TR 3712N 5 is
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Drager Standard 4 Gas Calibration Bump Mixture containing 50% LEL CH₄, 100 ppm CO, 25 ppm H₂S, 17% Vol. O₂ 4594655 1 CS bottle Approvals: according to EN 403:2004 W1092 Keyed:The Same Cotton TR 3712N 5 is Approvals: according to EN 403:2004 for fire escape hoods Air delivery certified CEESI