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Gas Clip Technologies SGC-H Single Gas Clip H2S, 2 Year Hydrogen Sulfide (H₂S) Detector, Set Points: Low-10 ppm High-15 ppm: Combination Explosive Gas Carbon Monoxide Detectors: Amazon.com: Tools & Home Improvement
BW Clip Real Time 2 Year H2S Detector 5-10 ppm BWC2R-H510
Oh for H2S sake get it right!, no more than 18" of Breath Zone of Safety
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Portable Hydrogen Gas Detectors | Personal Hydrogen Detection