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BENETECH GM8805 LCD Display Handheld Carbon Monoxide CO Monitor Detector Meter Tester, Measure Range: 0-1000ppm
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GXG-1987 Handheld Carbon Monoxide Meter with High Precision CO Gas Tester Monitor Detector Gauge 0-1000ppm GM8805 (Black) - - Amazon.com
GXG-1987 Handheld Carbon Monoxide Meter with High Precision CO Gas Tester Monitor Detector Gauge 0-1000ppm GM8805 (Black) - - Amazon.com