Best carbon monoxide detector in 2023 [Based on 50 expert reviews]

First Alert CO400A Battery Powered Carbon Monoxide Alarm

C $31.78  in stock
3 new from C $31.78
Free shipping
as of March 17, 2023 8:34 am


  • SAME AS CO400A ASIN: B004Y75ZS2
  • Battery operated, 9V battery included
  • Mute button, mutes unnecessary alarms. Also tests alarm function with same button
  • Low battery Signal mute, quiets low battery Signal for up to 8 hours
  • Electrochemical sensor, most accurate technology available for detecting carbon monoxide* *compared to other common sensing technologies

Kidde KN-COEG-3 Nighthawk Plug-in Carbon Monoxide and Explosive Gas Alarm with Battery Backup

C $73.48  in stock
11 new from C $64.47
Free shipping
as of March 17, 2023 8:34 am


  • Two alarms in one detects carbon monoxide and explosive gas
  • Three convenient mounting options. Humidity Range 5%-95% relative humidity (RH)
  • Digital display and peak level button displays the peak CO level recorded by the alarm since it was last reset
  • Battery backup 9 volt battery included
  • Kidde’s carbon monoxide alarms meet the requirements of Underwriters Laboratories (UL), an independent facility that tests products for compliance with widely-accepted safety standards

Kidde 900-0263CO-CA Plug-in Carbon Monoxide Alarm (KN-COB-DP2CA), White

C $42.30  in stock
5 new from C $31.85
1 used from C $39.34
Free shipping
as of March 17, 2023 8:34 am


  • AC Plug-in Operated – Easy to install – just plug into an AC wall outlet
  • AA Battery Backup – Provides continuous protection in case of a power failure.
  • Test / Reset Button – Tests the unit for proper operation. Resets the carbon monoxide alarm.
  • Tamper Resist Feature – If activated, unit goes into constant alarm mode if it has been unplugged or has come loose from the outlet.
  • CSA Listed

First Alert CO615A Carbon Monoxide Plug-In Alarm with Battery Backup and Digital Display

C $56.62  in stock
2 new from C $56.62
Free shipping
as of March 17, 2023 8:34 am


  • Plug & Protect, alarm plugs into any standard 120V AC outlet with no additional mounting. Line cord allows for multiple installation options
  • Ez view backlit digital display, easy viewing of danger levels, current, and peak CO levels in your home. Illuminates only when alarm sounds or a button is pressed
  • Battery backup, provides consistent protection for added safety during power outages
  • Ez access battery door, front-open compartment allows easy battery change without dismounting alarm
  • Mute button silences unnecessary alarms. It also tests alarm function with same button

First Alert Battery Operated Carbon Monoxide Alarm with Digital Display

C $33.60  in stock
as of March 17, 2023 8:34 am


  • Detects the presence of carbon monoxide
  • Easy to read digital display
  • Battery operated
  • Lets you know when its time to replace
  • Easy intstallation

Carbon Monoxide CO Alarm Detector, CUZMAK Digital Display Carbon Monoxide CO Beeps Alarm for Car Travel Home Bedroom House Living Room Basements, Clock Warning, UL2034.1-Pack

C $32.99  in stock
as of March 17, 2023 8:34 am


  • ►【High Sensitive & Quick Responsive】Build-in CO Alarm Chip and the electrochemical sensor, Enough to detect odorless invisible and deadly CO Alarm in the air, Quick reaction to save your life in the first time when fire hazard occurs. —【✅NOTE: IN NORMAL CONDITION, LCD IS NOT LIT FOR SAVING ENERGY (ENTER THE STANDBY STATE, AND STILL KEEP DETECTING/ALARMING). LCD WILL BE LIT TO DISPLAY THE ACTUAL CONCENTRATION AS CO LEVEL OVER 30PPM OR AS THE TEST/RESET BUTTON PRESSED】
  • ►【Safety And Visible】 CO Alarm detector With 3 digits LCD displayer is optional,'Err' on the LCD to indicate the unit is malfunctioning. 'Lb' on the LCS to indicate it low battery and need to replacement. '999ppm' on the LCD to indicate CO level over 999ppm And Loud 85 decibel alarm with LED Flash While in the Alarm Mode for the life-saving safety, protect the family from Carbon monoxide.
  • ►【Alarm Warning】When a dangerous level of co is detected the red LED will flashes and a loud alarm pattern will sound--Loud 85 decibel alarm with LED Flash.
  • ►【Easy Installation And Widely Used】Simple to use, Dimensions: 4 * 4 * 1.5 inch. carbon monoxide detector Coming with mounting accessories, just drill holes in appropriate positions, and done; Used for bedroom, kitchen, living room and any other area with a risk of fire danger can be installed a CO detector.
  • ►【Energy Saving】3 * 1.5V AA battery powered co Alarm detector (battery not included), Low Current consumption, Ultra-long Standy time. 12 months worry-free product guarantee, please contact seller first once you have any questions.

Carbon Monoxide Detector,CO Alarm Detector with Digital Display and Sound Alarm for Home 2pcs

C $39.99  in stock
as of March 17, 2023 8:34 am


  • 1:Light and Sound Alarm Warning: When a dangerous level of carbon monoxide is detected the red LED will flash and the alarm pattern will sound 85-decibel alarm to protect your family's life and property safety from CO detector.
  • 2: Alarm Standard: the alert time depend the level of carbon monoxide concentration. 50ppm, alert within 60 to 90 minutes; 100ppm, alert within 10 to 40 minutes; 300ppm, alert within 3 minutes.
  • 3: High Quality CO Alarm, UL2034 Certified Carbon Monoxide detector equipped with high accuracy and reliable long-life electrochemical CO sensor to detect CO gas leak quickly
  • 4:Power Supply: (DC3V) 2AA size batteries.(Not included) Sensor Type:Electrochemical Gas Detection Type:Carbon Monoxide Material: ABS

FIRST ALERT FATCO600, Carbon Monoxide Plug-in Alarm (No Backup or Display)

C $50.79  in stock
2 new from C $50.79
2 used from C $43.95
Free shipping
as of March 17, 2023 8:34 am


  • 120-volt AC plug-in carbon monoxide alarm
  • Uses electrochemical carbon monoxide sensor--the most accurate technology available
  • Simple to use silence/test button
  • Easy installation
  • End-of-life timer; 7-year limited warranty

Carbon Monoxide Detector Gas Leak Detector Portable Methane Propane Combustible Natural Gas Leak Sniffer Detector [3 in 1] Temperature Detector/ Humidity Sensor / CO Detector Air Quality Monitor Alarm Portable Design for Home Bedroom Office in-car Camping Indoor Outdoor

C $79.99  in stock
as of March 17, 2023 8:34 am


  • 【NDIR working method & 3 in 1 function】Our carbon monoxide detector is based on the principle of non dispersive infrared absorption (NDIR), to detect carbon monoxide in the air, capture the weak current generated by electrochemical reaction, detect the concentration of carbon monoxide accurately and quickly by every 2 seconds actual time. This multi-functional CO detector integrated CO / Temperature / Humidity detection functions, so that we can see the gas ambient level is good or not.
  • 【Accurate measuring range】CO measuring range: 0 - 500 ppm; Humidity measuring range: 20% ~ 80% RH; Temperature measuring range: 14℉ to 104 ℉(-10℃ to 40℃). Large Color 2.2'' circular HD display with value of carbon monoxide / humidity / temperature / and a cartoon face. Super large CO value typeface, You can confirm the carbon CO concentration at a glance.
  • 【Built-in high capacity 2400mAh battery】 With 2400mAh battery, this 3 in 1 CO detector can Continue working 90 hours with full charge; still support working when charging, which make this CO detector available working in varies occasions to prevent carbon monoxide-poiso`ning.
  • 【High performance CO detector】Dimensions: 3.26 × 3.26 × 1.25 inch; Weight: 4.8 oz. This CO detector is a high quality air quality detector, it features high accuracy, stable performance, jamming prevention, and low consumption. Don't hesitate to choose this beautiful shape carbon monoxide detector, and discard those traditional products without aesthetic feeling!
  • 【Color indicator light warning & Comfort emoji change & trill Alarm】[CO ppm: 0-100, Green indicator light and smile emoji show]; [CO ppm: 100-200, Yellow indicator light and expressionless emoji show warning]; [CO ppm: 200-500, Red indicator light and sad emoji show with trill Alarm].

Combination Smoke and Carbon Monoxide Detector Alarm, Beeps Warning Smoke Co Alarm Clock for Travel Home Bedroom Living Room Basement Attics, Battery Operated, Comply with UL 217 and UL 2034, 1 Pack

C $45.99  in stock
as of March 17, 2023 8:34 am


  • ✅Test this alarm First, HOW TO TEST IT(3 steps): 1. Install the batteries in clean air, then press the test button for five seconds to test the unit electronics, beeps will sound if it's normal; 2. Leave it in clean air for one minute; 3. put it into a sealed bag, spray some smoke or CO gas into the bag and seal it. Waiting for about one minute, the Alarm will go off if it's normal. NOTE: DO NOT test it by directly burning something under this alarm, which is an invalid test.
  • ✅Keep your family safe with this battery operated smoke and carbon monoxide alarm; battery powered alarms provide continuous monitoring of CO and smoke levels, even if there's a power failure. Features an electrochemical sensing technology and a photoelectric sensor that detects the larger particles of a smoldering fire. Please thoroughly read PRODUCT DESCRIPTION and the user manual before using.
  • ✅Indicator lights on the face of the unit display the presence of smoke and carbon monoxide, while an 85dB beeps siren provides a clear, loud warning upon detection
  • ✅ 2 * AA Battery-operated unit installs quickly and easily without an electrician, Can connect to other compatible detectors, To ensure all alarms will sound when threat is detected(Battery not included)
  • ✅Dimensions: 4 * 4 * 1.5 inch. Simple to use, NOTE: When installation please follow the circular arrow direction that Marked on the product for rotating the Mounting base/Bracket: PRESS DOWN AND TWIST; 【Do not install it in or near kitchens/garages/furnace room/bathrooms】. A single button tests the unit or silences the alarm. Low battery signal mute, quiets low battery signal for up to 8 hours. if there is any problems, please feel free to contact us, we are always here to help you.

Handheld Carbon Monoxide Meter 0-1000ppm, Portable CO Gas Leak Detector with LCD Display, High Precision CO Gas Tester Monitor Detector Gauge

C $78.59
C $54.99
 in stock
as of March 17, 2023 8:34 am


  • 【SMALL & PORTABLE】- Small size, light weight, easy to carry and operate.A portable instrument for the detection of carbon monoxide (Co) gas.
  • 【LCD SCREEN】- Clear and large LCD screen,LCD digital and character display for easy reading,battery: 3*AAA battery (Not included).
  • 【MEASURING RANGE】- With a wide measuring range, the ambient temperature can be measured in 2 temperature units (°C and °F),0~50°C/ 32~122°F temperature.
  • 【APPLICATION】- Carbon monoxide meter is widely used in petroleum, chemical, coal, metallurgy, paper, fire, municipal, telecommunications, food, textile and other industries.
  • 【PROFESSIONAL AFTER-SALES SERVICE】- We guarantee the product is 100% brand new. Please feel free to contact us if you have any problems about our product, then we will make every effort to resolve it for you,and give you a satisfactory answer.

First Alert CO615 Dual Power Carbon Monoxide Plug-in Alarm with Battery Backup and Digital Display (3 Pack)

C $118.36  in stock
2 new from C $118.36
Free shipping
as of March 17, 2023 8:34 am


  • Dual Power (plug in/electric and front load battery) ensures continuous protection to make certain the alarm will work at all times, even during power outages
  • Multi-function backlit digital screen allows you easily to see the carbon monoxide level and battery power indicators at a glance without pushing any buttons
  • Peak Level feature displays the highest concentration of carbon monoxide measured since the unit was last reset
  • Easily plugs into any standard outlet with no additional mounting necessary or it can also be mounted on any wall using the convenient power line cord (approx. 6 feet long)
  • Backed by a 7-year limited warranty and meets UL 2034 standard

First Alert SCO5RVA Battery Operated Combination Carbon Monoxide and Smoke Alarm

C $62.99  in stock
as of March 17, 2023 8:34 am


  • Combination smoke detector/carbon monoxide alarm detects two threats
  • Battery-operated unit installs quickly and easily without an electrician
  • Photoelectric sensor detects smoke while minimizing false alarms
  • Electrochemical CO sensor alerts you to carbon monoxide danger. Age 3 - 8 years
  • A single button tests the unit or silences the alarm. Where to install - kitchen, living room, basement, bathrooms, hallway, indoors

Portable Mini CO2 Detector, Seesii 3-in-1 Lightweight Air Quality Monitor for Carbon Dioxide Temperature Humidity with LED Digital Display and Sound Alert

C $59.99  in stock
as of March 17, 2023 8:34 am


  • Updated New Mini CO2 detector: Mini CO2 meter with a sturdy hook makes it easy to carry. The upgraded CO2 detector has a mute button that allows you to turn off the loud alert at any moment.
  • 3 in 1 Detector: This is very compact device that can detect and show the carbon dioxide, temperature and humidity level. CO2 detection range: 400-5000PPM. Temperature detection range: -10℃~55℃. Humidity detection range: 0-99%RH.
  • Precisely Monitors Indoor Air Quality: Built-in professional high-performance infrared sensor to accurately and quickly detect carbon dioxide.If the carbon dioxide concentration exceeds 1200ppm, an alarm will be issued immediately. If an alarm occurs, please take immediate action (open windows for ventilation or put some green plants, etc.)
  • Easy to Use: The air monitor comes with keychain so it's handy to attach and hang. And This air detector can be automatically calibrated after it is turned on, and automatic measurement will start after calibration.
  • Dense Opening Design: It facilitates heat dissipation and air circulation. The device's side and rear openings are designed to allow air to fully touch the sensor while also facilitating heat dissipation, which minimizes false alarms brought on by high temperatures and inadequate air contact with the outside.

Mini CO2 Detector, Aiment 3 in 1 Lightweight Carbon Dioxide Detector Air Quality Monitor Temperature Humidity Air Analyzer for CO2 Digital CO2 Meter Home Indoor Office for Anywhere You Can Use

C $59.99
C $47.99
 in stock
2 new from C $47.99
Free shipping
as of March 17, 2023 8:34 am


  • 【Multifunctional Carbon Dioxide Tester】This 3 in 1 CO2 monitor can detect real-time CO2 concentration, monitor indoor and outdoor humidity, and temperature. CO2 detection range: 400-5000PPM. Temperature detection range: 0-50℃. Humidity detection range: 0-99%RH.
  • 【Mini Air Quality Monition】The Air Quality Monitor is small and portable, easy to carry around as a decoration, you can check air quality anywhere and anytime. With Intelligent early warning system, high quality infrared NDIR sensor, multiple interference prevention.
  • 【Large Capacity Rechargeable Battery】The CO2 detector has a built-in large capacity rechargeable battery, charging takes only 2.5 hours, and standby up to 30hours. You can check the air quality from anywhere, or have the device continuously monitor at a specific location.
  • 【Full-Color LCD Screen】With full-color display and LCD screen design, this carbon dioxide detector is super easy to read. Digital display with intelligent backlight, eye protection function, one key operation.
  • 【Multi Application】Suitable for home, school, office, travel, indoor&outdoor, agricultural planting, production warehouse, and other occasions. We offer 3 months free return and lifetime warranty for our mini CO2 detector.

Lonnie Kimmons

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