All ALTAIR 2X Gas Detectors Incorporate proven XCell sensor technologyEnhance worker safety, compliance and traceabilityMinimize cost of ownershipDemonstrate rugged durability Product Options ALTAIR 2XP Gas Detector with XCell Pulse Technology: H2S -Features the first stand-alone bump test, which eliminates the need for bottled gas!Bump test anytime, anywhereBased on proven science and patented sensor capabilitiesALTAIR 2XP Gas Detector with XCell Pulse Technology: H2SALTAIR 2X Gas Detectors: CO, CO-HC (High Concentration), CO-H2 (Hydrogen Resistant), H2S-LC, SO2, NO2, NH3 and Cl2ALTAIR 2XT Two-Tox Gas Detector: COH2S, CO-H2H2S, COH2S-LC, CONO2 and SO2H2S-LC