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ALTAIR® 4X MSHA. Multigas Detector. Instruction Manual. In North America, to contact your nearest stocking location, dial toll-free 1-800-MSA-2222. Read this manual carefully before using the instrument. The instrument will perform as designed only if it is used and maintained in accordance with the Datasheets & User Manuals - Altair Datasheet Altair User Manual Altair Quick Start Guide Altair Pro Datasheet Altair Pro User Manual Bulletin: ALTAIR 2X GasView and Download MSA ALTAIR 4XR operating manual online. Multigas Detector. ALTAIR 4XR security sensors pdf manual download.