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Gas the device detects ch4: 0-100%lel o2: 0-25%vol co:0-1000ppm h2s: 0-100ppm most customers opt. This professional multi-gas detector provides continuous, real-time detection of toxic gases, oxygen deficiency, and flammable gas concentrations in confined spaces, oil and gas facilities, mining operations, and industrial sites. The MSA ALTAIR 4XR is equipped with rapid-response MSA XCell sensors that simultaneously detect up to four gases — including oxygen (O2), carbon monoxide (CO), hydrogen sulphide (H2S), and combustible gas (LEL) — with industry-leading response times of under 15 seconds. The MSA ALTAIR 5X extends coverage to up to 6 gases simultaneously, adding CO2 and exotic toxic gas sensor options for comprehensive atmospheric monitoring in complex industrial environments. The real-time clock, datalogging, and MotionAlert man-down alarm provide critical safety data for risk assessment and incident investigation. IP67 rated for full weather and water immersion protection.