MSA ALTAIR 5X Gas Monitor detects up to four critical atmospheric hazards. This advanced monitor delivers fast, reliable, and highly accurate readings of Oxygen (O2), Combustibles (LEL), Hydrogen Sulfide (H2S), and Carbon Monoxide (CO), ensuring maximum worker safety before and during entry into confined spaces. Its rugged design and MotionAlertâ„¢ feature offer indispensable protection on any job site.