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MSA 10116925 ALTAIR 5X Gas Detector, Monochrome Display Screen, LEL, O2, CO, H2S, SO2: Amazon.com: Tools & Home Improvement
ALTAIR 5X Multi-Gas Detector, 5 Gas: CO/H2S/LEL/O2/PID, Charcoal, Audible/Vibrating/Visual - 45KE54|10165445 - Grainger
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MSA 10092521 ALTAIR Single-Gas Detector - (H2S) Hydrogen Sulfide (Low: 10ppm, High: 15ppm), Color: Black, Portable Gas Monitor, Durable, UL Standard-Approved: Amazon.com: Tools & Home Improvement
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