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Lunarlipes Handheld Carbon Monoxide Meter, Portable Carbon Monoxide Detector, Professional-Grade CO Gas Tester with LCD Backlit Display, 0-1000PPM High Precision 1PPM Resolution (Battery Not Included) - - Amazon.com
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Handheld Carbon Monoxide Meter, Portable CO Gas Detector, Gas Tester with 0~1000ppm Range, 1PPM Resolution(Battery NOT Included) - - Amazon.com
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