... refinery Industry Coal Mine Underground Coal Mine, Pipeline, and Explosive Portable Multi-Gas Detector for CO, H2S, O2 and LELFEATURES* Color LCD Display* Self ... Casing Provides Anti-SlipHandleability* Detects CO, H2S, O2 and Combustible Gas* Rechargeable* Applying for ATEX approvalSPECIFICATIONSRange:CO: 0-1000 ppm O2 ... 23.5% by Vol. increasingLEL: 20 and 50% LEL BX616 Portable O2 Gas Detector