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Klein Tools ET110 CO Meter, Carbon Monoxide Tester and Detector with Exposure Limit Alarm, 4 x AAA Batteries and Carry Pouch Included - Amazon.com
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
Kidde Nighthawk Plug-in Electrochemical Explosive Gas and Carbon Monoxide Detector - Ace Hardware
CO Meter by Forensics | Low Level – Forensics Detectors
SCM4 - Carbon Monoxide Detector - Digital & Handheld CO Detector
SMART SENSOR Handheld Carbon Monoxide Detector Meter with High Precision CO Gas Tester Monitor Detector Gauge LCD Display Sound and Light Alarm 0-1000ppm - Walmart.com
Cheffort Handheld Carbon Monoxide Meter, Portable Carbon Monoxide Detector, Professional-Grade CO Gas Tester with LCD Backlit Display, 0-1000PPM Range for Industrial and Home (Battery Not Included) - Amazon.com
KN-COPP-B-LPM - Battery Operated Carbon Monoxide Digital Display Alarm