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MSA 10178557 ALTAIR 4XR Multigas Detector - (O2, H2S, CO), Color: Charcoal, Portable Gas Monitor, Durable, Handheld, UL/CSA Approval, Includes Instrument Only - Amazon.com
ALTAIR 4XR, Carbon Monoxide/Combustible Gas/Oxygen, CO/LEL/O2, Multi-Gas Detector - 481P60|10178567 - Grainger
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