Four gas detection Oil&Gas, Steel refinery Industry Coal Mine Underground Coal Mine, Pipeline, and Explosive Portable Multi-Gas Detector for CO, H2S, O2 and LELFEATURES* ... -SlipHandleability* Detects CO, H2S, O2 and Combustible Gas* Rechargeable* Applying for ATEX approvalSPECIFICATIONSRange:CO: 0-1000 ppm O2: 0-30% by VolumeH2S: ... by Vol. increasingLEL: 20 and 50% LEL BX616 Portable O2 Gas Detector