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BW Technologies GA24XT-H-B50 GasAlertClip Extreme 2-Year Detector, H2S, 0-100 ppm Measuring Range, 10 to 15 ppm Alarm Setpoint (Pack of 50): Science Lab Geiger Counters: Amazon.com: Tools & Home Improvement
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Gas Sensors BWT GasAlert Extreme H2S High Range (Hydrogen Sulfide) Detector, 0-500 ppm (GAXT-H-2-DL) - Gas-Sensing.com
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