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BW BWC4-B-N Clip4 4-gas detector (O2, LEL, H2S, CO), North American version Black Housing | ProcessControlExperts
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BW Technologies BWC4-Y-N Clip4, 4-gas (Combustible, O2, LEL, H2S, CO) - 2-Year Detector, Mixture of Lexan, TPE and Plastic, Yellow, 4.7" X 2.7" X 1.3": Amazon.com: Tools & Home Improvement
BW Technologies® Clip4 Multigas Detector: Carbon Monoxide, Hydrogen Sulfide, Oxygen, LEL - Conney Safety
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