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MSA 10154074 ALTAIR 2X Gas Detector, CO-H2, (Hydrogen Resistant Carbone Monoxide), Gray: Amazon.com: Tools & Home Improvement
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MSA 10154080 Altair 2X CL2 Chlorine Single Gas Detector, Low Alarm 0.5 ppm, High Alarm 1 ppm, 2 Year Warranty - Durawear.com
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