Kidde Nighthawk Plug-In w/Battery Back-up Electrochemical Explosive Gas and Carbon Monoxide Detector - Ace Hardware
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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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Amazon.com: Pyle Meters Hand Held Carbon Monoxide Meter - High Accuracy and 1000 PPM Measurement Range CO Sensor w/Digital LCD Display Auto Power Off Battery Operated and Control Buttons - Pyle PCMM05 :
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Lunarlipes Handheld Carbon Monoxide Meter, Portable CO Carbon Monoxide Detector, CO Gas Tester with LCD Backlit Display, 0-1000PPM High Precision 1PPM Resolution (Battery Not Included) AS8700A - - Amazon.com
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