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REED Instruments - Natural Gas, Carbon Monoxide & Refrigerant Detectors; Detector Type: CO Meter; Display Type: LCD; Humidity Range: 10 to 90% - 10165991 - MSC Industrial Supply
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Lunarlipes Handheld Carbon Monoxide Meter, Portable Carbon Monoxide Detector, Professional-Grade CO Sensor Tester with LCD Backlit Display, 0-1000PPM Range for Industrial & Home (Battery Not Included) - Amazon.com
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