Low cost of ownership. Fastest sensor response times, lowest calibration gas flow rate on the market. 4-year expected sensor life. 3-year warranty on instrument most sensors (2 years on Cl2, NH3). Stand-alone bump tests reduce maintenance, increase productivity (ALTAIR 2XP only). 1 device can monitor 2 gases (ALTAIR 2XT only). Increased safety awareness real-time compliance. Stand-alone bump test anytime, anywhere without specific calibration gas (ALTAIR 2XP only). Bump pass: green LED flash every 15s, large on-screen checkmark. Bump fail or expiration: red LED flash every 15s, no checkmark. End-of-sensor-life warning and alarm. Full-time traceability. Records 75 alarm events. 150+ hours of periodic data (ALTAIR 2X and 2XP). 100+ hours of periodic data (ALTAIR 2XT). Compatible with MSA GALAXY® GX2 Automated Test System and MSA Link Pro software. Rugged durability. Tough over-molded rubber armor. Survives multiple 25-ft drops onto concrete. Agency-certified dust- and water-tight IP67 construction. Intrinsically-safe design.