Klein Tools ET110 CO Meter, Carbon Monoxide Tester and Detector with Exposure Limit Alarm, 4 x AAA Batteries and Carry Pouch Included

TopTes CT-300 Portable Carbon Monoxide Detector, CO Detector with Audible & Visual Alarm, 0-5000PPM, CO Alarm, Backlit LCD Screen, for Home, Car, Camping& Travel (Includes Battery x3) - Orange

VEVOR Carbon Monoxide Detectors, 0-1000PPM Portable CO Detector with Audible & Visual Alarm, Handheld CO Gas Meter Tester with Temp Sensor, LCD Backlit Screen for Industrial/Home (Include 3 x Battery)

PUTECCH Carbon Monoxide Detectors, Portable CO Detector Battery Powered, Handheld Carbon Monoxide Monitor Alarm Detector with LCD Display for Home/Outdoor/Travel (Batteries Included)

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)

Lunarlipes Carbon Monoxide Detectors, Portable CO Detector with Temperature Sensor ＆ LCD Backlight Screen, Handheld Carbon Monoxide Meter Tester 0-1000PPM Range, Indoor/Oudoor (Includes Battery x3)

Handheld Carbon Monoxide Meter, 3-in-1 Portable CO Gas Detector, CO Monitor Temp/Humidity Detector with Color LCD Display, Voice and Vibration Alarm for Home/Travel/Industrial(Battery Not Included)

Portable Carbon Monoxide Detectors, 1000 mAh Rechargeable CO Detector with HD LCD Display, 3-in-1 Accurate and Fast Response Carbon Monoxide Meter for Travel Camping RV Car Hotel Home Indoor Outdoors

Carbon Monoxide Detectors, Portable CO Detector with Audible & Visual Alarm, 2.4-in Backlit Screen 0-1000PPM Travel CO Gas Meter for Home, Industrial and Outdoor (Includes Battery x3)

Fieldpiece SCM4 Carbon Monoxide Detector, 1-Pack