Mix gas 25 ppm H2S - 50 ppm CO, 2.5% (50%LEL) Methane (CH4), 18% O2 N2 Balance Vol : 58 Liter Cylinder Type : 8AL Aluminium Cylinder Recommend using regulator 715 Provide COA & MSDS Exp Date : Apr 2024 Suitable for Calibration or bump test for BW Honeywell, MSA, Crowcon, Draeger, Riken, Rae and All Gas Detector