Best Carbon Monoxide Detectors 2025

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Last Updated - 09/06/2025

Best Choice

01

Ei Electronics

Ei Electronics Ei208D 10-Year Carbon Monoxide Alarm

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9.8

Exceptional

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Real carbon monoxide, calibrated
German version, intended for sale in German-speaking countries only
Carbon monoxide alarm with electrochemical sensor (with LCD display).
Built-in, non-removable 10-year lithium battery (Panasonic)
Box contents: 1x CO detector (Ei208D) with mounting plate, manual, screws and dowels

35,90 €
02

X-Sense

X-Sense CO03D Carbon Monoxide Detector with Digital Display, CO Detector, Accurate Sensor with 10-Year Life, Replaceable Battery, Certified According to EN 50291

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9.5

Excellent

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Quality assurance: Tested by TÜV Rheinland and in accordance with the standard EN 50291.
Large LCD display and high sensitivity: Clearly displays battery life and real-time CO values from the ambient air, with an updated measurement every 10 seconds; responds to various CO thresholds, with the lowest alarm threshold at 30 ppm to ensure your ultimate protection against carbon monoxide.
Flexible and easy installation: No need to worry about cables or sockets, because our battery-operated CO alarm comes with screws and anchors, so it can be quickly and easily installed anywhere.
Accurate and responsive: Equipped with an advanced electrochemical Figaro CO sensor and a powerful ST chipset, the X-SENSE carbon monoxide alarm instantly and accurately detects the concentration values of CO, an invisible, lethal gas, while minimising false alarms; designed to warn you of a CO threat as early as possible, with a loud 85 dB alarm and a fast flashing red LED indicator.
10-year protection around the clock: With 3 replaceable 1.5 V AA batteries and a sensor life of 10 years, this CO alarm provides the best protection 24/7, even in the event of power outages; a low battery warning alert informs you when the batteries need to be replaced, and an end-of-life warning lets you know when it's time to replace the unit.

32,99 €
03

X-Sense

X-Sense XC0C-SR Carbon Monoxide Detector, 10 Year Sensor, CO Detector with Replaceable Battery and Digital Display, Carbon Monoxide Detector with Test Button

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9.4

Excellent

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Versatile placement options: this freestanding CO detector can be placed on any flat surface, such as a desk, bookshelf or nightstand; screws for wall mounting are also included
Slim and compact: this small and discreet CO detector measures just 75 × 142 × 32 mm and looks good in any room. Style and safety go hand in hand here
Intuitive operation: thanks to the separate buttons, this detector is quick and easy to use even in emergency situations; it provides reliable access to important functions such as checking CO peaks or testing/mute the alarm
Easy to understand: the current CO value is displayed on a clear display; a three-colour LED informs you at a glance about the status of the detector: red for alarm, yellow for error or low battery and green for normal operation
10 YEAR LIFESPAN Protect your loved ones from the silent threat of carbon monoxide with this reliable CO detector that will accompany you for 10 years! The detector is powered by replaceable AA batteries with a service life of 3 years

18,99 €
Value for Money

04

X-Sense

X-Sense XC01-R Carbon Monoxide Detector with Digital LCD Display, CO Detector with Replaceable 5-Year Battery and Peak Memory

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27% Off
9.1

Excellent

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Precise and reliable: equipped with a Figaro electrochemical CO sensor and a replaceable battery with a life of 5 years
PLEASE NOTE: STANDALONE, NOT COMPATIBLE WITH THE SBS50 BASE STATION
Instant alerts: A loud 85 decibel alarm alerts you of dangerous CO levels early
INTUITIVE LIGHT A 3-color LED indicator flashes red, green or yellow to alert alarm, power supply, or fault
INFORMATIVE DISPLAY An easy to read LCD display shows CO values in real time and stores CO peaks since the previous reset
FLEXIBLE INSTALLATION This detector can be easily installed on the wall or freestanding and can even be used when traveling

25,49 € 35,39 €(27% Off off)
05

DGSFFHFSD

Carbon Monoxide Alarm with LCD Display CO Detector Louder 85 dB Alarm Carbon Monoxide Detector with Carbon Monoxide Sensor Carbon Monoxide Alarm Battery Operated

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15% Off
8.8

Very Good

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Main highlights

Safe sensors, clear alarm: the carbon monoxide detector uses particularly sensitive sensors. So you measure CO densities in your ambient air continuously. Reach concentrations corresponding limit values, give CO detectors h?rbaren alarm. Mostly flashing LEDs attract your attention.
Robust operation of the sensor: the CO gas detector is made of durable and high quality. High performance sensor, which is sensitive and durable. The operating temperature is 5 °C / 40 °C, and the appropriate relative humidity is 20-90%.
LCD display with CO concentration display: carbon monoxide as a daily respiratory poison you do not perceive with your natural senses. Thanks to the LCD display, you can read and monitor the CO concentration at any time as well as avoid the occurrence of hazards.
DGSFFHFSD specialises in the development and production of carbon monoxide warning detectors. Wir bieten Ihnen 30 t?gige 100% R¨¹cksendungsgarantie und lebenslangen Kundendienst an. Your satisfaction is our size ?te motivation. If you have any further questions, please contact us directly.
Battery operated: the CO detector uses the replaceable batteries (2 x 1.5 V AA). Even more convenient, integrated power cells ensure many years of operation. A chirping every 30 seconds indicates that the battery is low, then you have to replace it. (Batteries not included)

17,84 € 20,99 €(15% Off off)
06

Nemaxx

NEMAXX® Carbon Monoxide Detector with Aucustic & Optical Alarm - Co Detector House & Motorhome / Caravan Carbon Monoxide Detector Carbon Monoxide Detector Carbon Monoxide Meter Battery Operated

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8.6

Very Good

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Main highlights

️ Low battery warning:
Test button for function test
Strong anti-interference
Portable and compact
LCD display
High strength and stability
High sensitivity thanks to electrochemical sensor
Easy to install
Acoustic (>85 dB) and optical (LED) alarm
24 hours protection for you and your family

19,90 €
07

DGSFFHFSD

Carbon Monoxide Warning Detector LCD Display CO Detector 85 dB Alarm Carbon Monoxide Sensor Carbon Monoxide Detector with Test Button Battery Operated (without Batteries) GAS-96776

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19% Off
8.5

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Quality assurance: We specialise in the development and production of carbon monoxide warning detectors. We offer you 30-day 100% return guarantee and lifetime customer service. Your satisfaction is our greatest motivation. If you have any further questions, please contact us directly. We will answer you within 24 hours.
LCD display: carbon monoxide as a deadly breathing gas, you cannot perceive it with your natural senses. The LCD of the carbon monoxide detector shows the carbon monoxide concentration when the air contains 30 ppm. Thanks to the LCD display of the gas detector, you can read and monitor the CO concentration at any time and avoid the occurrence of hazards.
Highly accurate CO sensor: the carbon monoxide alarm uses sensors based on The CO detector continuously measures CO densities in its ambient air. As soon as the concentrations reach corresponding limits, these detectors give an audible alarm. As a rule, you will attract attention when flashing LEDs.
Flexible and easy installation: no wiring and sockets required, because our battery-operated CO detector screws and wall dowels are available, which can be quickly and easily installed anywhere.
85 dB alarm and battery drive: In an emergency, the carbon monoxide alarm sounds an alarm over 85 dB, which can immediately alert people throughout the house. The carbon monoxide alarm uses the replaceable batteries (2 x 1.5 V AA). A "chirp" every 30 seconds indicates what is reminiscent of low batteries and ensures that you don't miss a battery change. (Batteries not included)

16,55 € 20,49 €(19% Off off)
08

Ruan

Carbon Monoxide Detector, 10-Year Battery CO Detector with LCD Display and Silent Test Button, EN50291 Compliant, Carbon Monoxide Warner (TCS0202A)

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8.4

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Quality assurance: the products have been tested and comply with EN50291 standard, so you can shop with a clear conscience
Precise alarm: when the indoor CO level exceeds the norm, the clear LCD display shows the value in time, the red alarm light will light up and the 85dB alarm will sound so you don't miss the alarm
Electrochemical CO Sensor: the CO detector is equipped with an electrochemical carbon monoxide sensor that quickly and accurately detects dangerous CO concentrations from 23ppm to 999ppm and emits an alarm sound above 85dB to warn you as early as possible
Easy to use: this carbon monoxide detector can be wall mounted, also can be placed on the table, small and beautiful. Suitable for a variety of places, home, office, hotel, caravan is also suitable to bring travel
Carbon monoxide detector with 10 year battery: battery and sensor life of up to 10 years (up to 10 years from the first power-on) with test and mute functions for a secure feeling

18,99 €
09

X-Sense

X-Sense CO Detector with Peak Memory, Carbon Monoxide Detector, Accurate Sensor with 10 Year Battery & LCD Display, TÜV Rheinland Certified According to EN 50291, XC04-R

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24% Off
8.2

Good

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Main highlights

【Tri-color LED Indicator】The device has a tri-color LED indicator that lights green, red or yellow to indicate that it is on, an alarm has been triggered or an error has occurred. At the same time, a clearly audible beep is emitted
Stored peak values of CO concentration: LCD display automatically records and stores CO peaks so that an alarm triggered in your absence can be confirmed based on the recorded peak value
REPLACEABLE 5 YEAR BATTERY The alarm is equipped with a replaceable lithium battery to ensure 5 years of uninterrupted protection. When the battery is low, a warning message alerts you when the battery needs to be replaced for safety reasons
Free standing device with unique design: this carbon monoxide detector can be freely placed on the desk or other flat surface, so you don't have to drill holes in the wall. The compact size of 135 × 63 mm ensures that the device takes up little space
FIGARO CO SENSOR WITH 10 YEARS LIFE - This carbon monoxide detector with a lifetime of up to 10 years has an integrated advanced Figaro sensor that detects dangerous CO concentrations more accurately and thus reacts faster

23,55 € 30,99 €(24% Off off)
10

Andyssey

Andyssey ZA326 Carbon Monoxide Detector with LCD Display, Portable CO Alarm Detector with Replaceable Battery, 10 Year Sensor, 85 dB Alarm Volume, Pack of 1

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8.1

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Visual CO concentration memory: the CO detector automatically stores the highest CO concentrations in the LCD display. This allows you to track and check alarms even when you were away from home, thus better understanding the cause of alarm triggers. A three-colour LED informs you at a glance about the status of the detector: red for alarm, yellow for error and green for normal operation.
LONG TERM PROTECTION WITH REPLACEABLE BATTERIES: The carbon monoxide detector provides reliable, long-term protection thanks to a 10-year lifespan. The batteries are replaceable, you will be warned by bright and acoustic signals that you need to change the batteries or replace your device.
Effective protection against carbon monoxide (CO): The advanced electrochemical CO sensor detects dangerous carbon monoxide concentrations from 23 ppm to 999 ppm in real time and alerts you with a loud alarm (85 dB) to avoid danger early and ensure your safety.
Easy installation and versatile placement options: this portable carbon monoxide meter can be easily placed on any flat surface such as a table, shelf or bedside table. In addition, all necessary mounting materials are included to safely install the carbon monoxide detector on the wall - for maximum flexibility in placement.
COMPACT, PORTABLE AND FAMILY FRIENDLY With its minimalist design, the CO detector is both compact and portable. This monoxide detector can be wall mounted or used freestanding and fits perfectly into any home, office, hotel or even when travelling, at the same time blends elegantly into your living environment.

19,99 €