The MSA ALTAIR® 5X Multigas Detector monitors combustible gas (LEL), O₂, CO and H₂S, with rapid-response XCell® sensors. It is ruggedized for job-site use, operating in temperatures from -40 °C to +60 °C, weighs approximately 0.300 kg (0.661 lb) and features a compact design with dimensions 47 mm × 89 mm × 170 mm (1.85″ × 3.50″ × 6.69″).