Updated:March, 2026

10 Best Carbon Monoxide Detectors For Hvac of 2026

Best Choice

9.9

Outstanding

TOPTES

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

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Why We Love It

Carbon Monoxide Detector: TopTes CT-300 is an ideal portable CO tester to help you detect CO gas concentrations timely and accurately, reducing the risk of CO poisoning and protecting your life. It is a must-have tool for homeowners, drivers, campers, DIY-ers, tourists, etc
Swift & Precise Measurement: The CT-300, with an advanced electrochemical sensor head, swiftly detects CO levels from 0-5000 ppm. Its sensitivity ensures early warnings, allowing timely actions to prevent health risks. Accurate readings empower quick decisions, promoting safety and well-being. Versatile and portable, it guards against CO in various settings, ensuring peace of mind
Visual & Audible Alarm: The travel CO detector uses both visual and audible alarms. When the concentration of CO reaches the alarm threshold, the screen changes color and emits an urgent alarm sound to alert you of the presence of CO gas in your surroundings, allowing you to promptly detect the danger, protect yourself
User-Friendly Functions: With high-quality ABS and PC material and anti-slip edge texture, CT-300 is durable and portable; It can be used for 40 hours with new batteries; Low-power indicator will remind you of time to change batteries; It will automatically switch off when not in operation or when no gas is detected within 10 minutes to save power (can be canceled); Backlit screen for easy viewing, adaptable to dim environments
Correct detection method: You can detect whether the CT-300 is working properly by detecting smoke from cigarettes, or burning organic matter (paper, etc.) in a sealed container. You will receive CT-300 Carbon Monoxide Detector, Protective Case, AAA Batteries, User Manual

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Why We Love It

Carbon Monoxide Detector: TopTes CT-300 is an ideal portable CO tester to help you detect CO gas concentrations timely and accurately, reducing the risk of CO poisoning and protecting your life. It is a must-have tool for homeowners, drivers, campers, DIY-ers, tourists, etc
Swift & Precise Measurement: The CT-300, with an advanced electrochemical sensor head, swiftly detects CO levels from 0-5000 ppm. Its sensitivity ensures early warnings, allowing timely actions to prevent health risks. Accurate readings empower quick decisions, promoting safety and well-being. Versatile and portable, it guards against CO in various settings, ensuring peace of mind
Visual & Audible Alarm: The travel CO detector uses both visual and audible alarms. When the concentration of CO reaches the alarm threshold, the screen changes color and emits an urgent alarm sound to alert you of the presence of CO gas in your surroundings, allowing you to promptly detect the danger, protect yourself
User-Friendly Functions: With high-quality ABS and PC material and anti-slip edge texture, CT-300 is durable and portable; It can be used for 40 hours with new batteries; Low-power indicator will remind you of time to change batteries; It will automatically switch off when not in operation or when no gas is detected within 10 minutes to save power (can be canceled); Backlit screen for easy viewing, adaptable to dim environments
Correct detection method: You can detect whether the CT-300 is working properly by detecting smoke from cigarettes, or burning organic matter (paper, etc.) in a sealed container. You will receive CT-300 Carbon Monoxide Detector, Protective Case, AAA Batteries, User Manual

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9.5

Excellent

KLEIN TOOLS

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

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Main Highlights

ACCURATE CO GAS MEASUREMENT: Detect and measure carbon monoxide gas levels with precision using our easy-to-use CO meter
PORTABLE AND PROTECTIVE: Carry our CO detector anywhere for user safety, with a built-in short-term exposure limit (STEL) alarm
DUAL ALARM SYSTEM: Stay informed about CO levels with both low (35 ppm) and high (200 ppm) level alarms, ensuring prompt action
AUDIBLE AND VISUAL ALERTS: Receive immediate warnings through audible and visual alarms, providing increased safety and peace of mind
CLEAR DISPLAY: Backlit display shows CO measurements (0 to 1000 ppm) and temperature (Fahrenheit and Celsius) for easy reading
BATTERY SAVING FEATURE: Auto-power off after 20 minutes of inactivity helps conserve battery life, extending the device's usability
CONVENIENT PACKAGE: Includes a carrying pouch and 4xAAA batteries, making it easy to transport and operate the CO meter efficiently

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Main Highlights

ACCURATE CO GAS MEASUREMENT: Detect and measure carbon monoxide gas levels with precision using our easy-to-use CO meter
PORTABLE AND PROTECTIVE: Carry our CO detector anywhere for user safety, with a built-in short-term exposure limit (STEL) alarm
DUAL ALARM SYSTEM: Stay informed about CO levels with both low (35 ppm) and high (200 ppm) level alarms, ensuring prompt action
AUDIBLE AND VISUAL ALERTS: Receive immediate warnings through audible and visual alarms, providing increased safety and peace of mind
CLEAR DISPLAY: Backlit display shows CO measurements (0 to 1000 ppm) and temperature (Fahrenheit and Celsius) for easy reading
BATTERY SAVING FEATURE: Auto-power off after 20 minutes of inactivity helps conserve battery life, extending the device's usability
CONVENIENT PACKAGE: Includes a carrying pouch and 4xAAA batteries, making it easy to transport and operate the CO meter efficiently

9.5

Excellent

TOPTES

TOPTES CT-580 Portable Carbon Monoxide Detector, Rechargeable CO Detector with Vibration, Visual & Audible Alarms, 0-1000PPM, TFT Color Display for Home, Camping, Travel, Industrial & Professional Use

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Main Highlights

Fast and Accurate: The TOPTES CT-580 Carbon Monoxide Detector is equipped with a high-sensitivity, high-accuracy DDS sensor that provides quick response within 0.3 seconds. It can detect CO gas concentrations from 0 to 1000 PPM and features two alarm thresholds, allowing you to quickly assess changes in your surroundings for peace of mind
Suitable for Individual and Business Use: For personal needs, this CO alarm is ready to operate right out of the box, with a straightforward graphical display for easy reading. For business needs, it offers advanced menu options, including alarm history and both zero and standard gas calibration settings
Three Alarm Modes: The CO alarm features three alarm modes: indicator light, audible alarm, and vibration. When the CO concentration reaches the alarm threshold, all three modes activate simultaneously, ensuring reliable alerts in various environments, adapting to different conditions
User-Friendly & Durable Design: The CT-580 is made from high-quality ABS engineering plastic for easy grip and use. It also features adjustable screen brightness, auto screen-off, a built-in flashlight, and USB-C charging, providing convenience and user-friendly functionality in every aspect
Certified Precision and Trusted Reliability: Certified by a national accredited lab, it is a reliable and trusted handheld CO for accurate monitoring in any environment. You will receive CT-580 Carbon Monoxide Detector, Protective Case, Type-C Charging Cable, User Manual

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Main Highlights

Fast and Accurate: The TOPTES CT-580 Carbon Monoxide Detector is equipped with a high-sensitivity, high-accuracy DDS sensor that provides quick response within 0.3 seconds. It can detect CO gas concentrations from 0 to 1000 PPM and features two alarm thresholds, allowing you to quickly assess changes in your surroundings for peace of mind
Suitable for Individual and Business Use: For personal needs, this CO alarm is ready to operate right out of the box, with a straightforward graphical display for easy reading. For business needs, it offers advanced menu options, including alarm history and both zero and standard gas calibration settings
Three Alarm Modes: The CO alarm features three alarm modes: indicator light, audible alarm, and vibration. When the CO concentration reaches the alarm threshold, all three modes activate simultaneously, ensuring reliable alerts in various environments, adapting to different conditions
User-Friendly & Durable Design: The CT-580 is made from high-quality ABS engineering plastic for easy grip and use. It also features adjustable screen brightness, auto screen-off, a built-in flashlight, and USB-C charging, providing convenience and user-friendly functionality in every aspect
Certified Precision and Trusted Reliability: Certified by a national accredited lab, it is a reliable and trusted handheld CO for accurate monitoring in any environment. You will receive CT-580 Carbon Monoxide Detector, Protective Case, Type-C Charging Cable, User Manual

9.2

Excellent

AEGTEST

AEGTEST AGT-2459 Portable Carbon Monoxide Detector, Rechargeable CO Detector, 0~1000PPM with Audible & Visual Alarms, TFT Color Screen for Home/Travel/Industrial and Mobile Operations - Blue

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Main Highlights

Fast and accurate: AEGTEST AGT-2459 carbon monoxide detector uses a high-precision DDS sensor to detect CO levels from 0 to 1000 PPM. With a 10-second warm-up, it delivers instant response within 1 second for quick detection of the surrounding environment, designed for the reliability of domestic and industrial sites
Multiple alarm modes: Features sound, light, and vibration alarms. The color LCD clearly shows gas concentration. When CO levels reach the set threshold, the red indicator flashes, the device vibrates, and an alarm sounds to enhance safety. Multiple alarm thresholds can be selected to suit different environments
High flexibility: Compact and portable, quick startup, responsive, suitable for non-continuous and unfixed detection points, respond to unexpected accidents, safety assessment of the environment. Helps protect personal safetysuitable for home use, outdoor travel, camping, and maintenance teams
User-friendly: Features a sleek pen-style design with anti-slip textured edges, making it comfortable to hold and easy to carry. Type-C charging with up to 10 days of battery life, efficient energy-saving operation, no frequent battery replacements, and eco-friendly
You will get: 1 x AGT-2459 Carbon Monoxide Detector, 1 x User Manual, 1 x Type-C USB Charging Cable

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Main Highlights

Fast and accurate: AEGTEST AGT-2459 carbon monoxide detector uses a high-precision DDS sensor to detect CO levels from 0 to 1000 PPM. With a 10-second warm-up, it delivers instant response within 1 second for quick detection of the surrounding environment, designed for the reliability of domestic and industrial sites
Multiple alarm modes: Features sound, light, and vibration alarms. The color LCD clearly shows gas concentration. When CO levels reach the set threshold, the red indicator flashes, the device vibrates, and an alarm sounds to enhance safety. Multiple alarm thresholds can be selected to suit different environments
High flexibility: Compact and portable, quick startup, responsive, suitable for non-continuous and unfixed detection points, respond to unexpected accidents, safety assessment of the environment. Helps protect personal safetysuitable for home use, outdoor travel, camping, and maintenance teams
User-friendly: Features a sleek pen-style design with anti-slip textured edges, making it comfortable to hold and easy to carry. Type-C charging with up to 10 days of battery life, efficient energy-saving operation, no frequent battery replacements, and eco-friendly
You will get: 1 x AGT-2459 Carbon Monoxide Detector, 1 x User Manual, 1 x Type-C USB Charging Cable

9.0

Excellent

Lunarlipes

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)

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Main Highlights

PRECISION CO METERHandheld carbon monoxide meter with sensitive professional electrochemical sensor can detect CO range from 0~1000PPM and temperature range from 32~122 / 0~50. With auto-calibration function, it can help you detect carbon monoxide gas concentration timely and accurately, reduce the risk of carbon monoxide poisoning, and protect the life and property of you and your family.
SOUND AND LIGHT ALARM & SELF-SET ALARM VALUECarbon monoxide detector adopts visual and audible alarm, alarm value can be set freely (preset 24PPM). When the detected CO gas concentration reaches the alarm threshold, the CO detector will emit a beep sound and screen flashing alarm to remind you of the presence of carbon monoxide gas around you, so that you can detect the danger in time to protect yourself. Click the ON/OFF button to turn the beeping sound on or off.
4 TEST MODESCarbon monoxide tester has 4 test modes, namely: real-time data, data hold, maximum value, minimum value.The power-on warm-up time of the CO tester is 120 seconds, and you can press the ON/OFF button to enter the test mode directly. In the test mode, just click the MODE button to switch between the four test modes easily. You can adjust the appropriate mode according to your usage or working environment.
PRACTICAL DESIGNPortable carbon monoxide detector is small in size and light in weight, easy to use with one hand. With back clip design on the back, it is very easy to work and carry. The HD LCD backlit screen makes the carbon monoxide reader easy to use even at night. In addition, you can set whether or not to turn on the auto power off function (when the auto power off function is turned on, if there is no operation for 10 minutes, it will turn off automatically to save power).
APPLICATION SCOPEThe portable CO detector has the characteristics of wide measurement range, high measurement accuracy, small size, easy portability, and simple operation. Can be widely used in indoor and outdoor, homes, garages, offices, schools, hospitals, supermarkets, travel, ships, airplanes, cars and RVs and other places, as well as coal, oil drilling rigs, textiles, chemicals, metallurgy, papermaking, fire protection, municipal administration, etc. industry.
SHOP WITH CONFIDENCEYour satisfaction is our top priority. We provide 3 years service and lifetime technical support for Carbon Monoxide Meter AS8700A. If you encounter any problems, just contact us through Amazon Customer Service or Q&A and we will reply within 12 hours. Risk-free shopping. Customer satisfaction is our tireless pursuit!

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Main Highlights

PRECISION CO METERHandheld carbon monoxide meter with sensitive professional electrochemical sensor can detect CO range from 0~1000PPM and temperature range from 32~122 / 0~50. With auto-calibration function, it can help you detect carbon monoxide gas concentration timely and accurately, reduce the risk of carbon monoxide poisoning, and protect the life and property of you and your family.
SOUND AND LIGHT ALARM & SELF-SET ALARM VALUECarbon monoxide detector adopts visual and audible alarm, alarm value can be set freely (preset 24PPM). When the detected CO gas concentration reaches the alarm threshold, the CO detector will emit a beep sound and screen flashing alarm to remind you of the presence of carbon monoxide gas around you, so that you can detect the danger in time to protect yourself. Click the ON/OFF button to turn the beeping sound on or off.
4 TEST MODESCarbon monoxide tester has 4 test modes, namely: real-time data, data hold, maximum value, minimum value.The power-on warm-up time of the CO tester is 120 seconds, and you can press the ON/OFF button to enter the test mode directly. In the test mode, just click the MODE button to switch between the four test modes easily. You can adjust the appropriate mode according to your usage or working environment.
PRACTICAL DESIGNPortable carbon monoxide detector is small in size and light in weight, easy to use with one hand. With back clip design on the back, it is very easy to work and carry. The HD LCD backlit screen makes the carbon monoxide reader easy to use even at night. In addition, you can set whether or not to turn on the auto power off function (when the auto power off function is turned on, if there is no operation for 10 minutes, it will turn off automatically to save power).
APPLICATION SCOPEThe portable CO detector has the characteristics of wide measurement range, high measurement accuracy, small size, easy portability, and simple operation. Can be widely used in indoor and outdoor, homes, garages, offices, schools, hospitals, supermarkets, travel, ships, airplanes, cars and RVs and other places, as well as coal, oil drilling rigs, textiles, chemicals, metallurgy, papermaking, fire protection, municipal administration, etc. industry.
SHOP WITH CONFIDENCEYour satisfaction is our top priority. We provide 3 years service and lifetime technical support for Carbon Monoxide Meter AS8700A. If you encounter any problems, just contact us through Amazon Customer Service or Q&A and we will reply within 12 hours. Risk-free shopping. Customer satisfaction is our tireless pursuit!

8.8

Very Good

Sensorcon

Sensorcon Inspector Industrial Pro Portable Carbon Monoxide Detector – Fast-Response Intrinsically Safe CO Detector with Adjustable Visual, Audio & Vibration Alerts

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Main Highlights

Professional-Grade CO Detection: Equipped with advanced electrochemical sensor and proprietary embedded software, this portable carbon monoxide sensor (INS-CO-03) delivers accurate, reliable readings of CO concentrations in parts per million (ppm).
Triple Alerts for Safety: With a 24-hour TWA and adjustable alarm levels, this portable CO detector lets you set alarm points from 1 ppm to 500 ppm, triggering visual LED indicators, 8085 dB audible alerts, and vibrating alarms at key thresholds.
Intrinsically Safe Build: Designed to ensure reliable performance in potentially explosive environments, this handheld carbon monoxide detector features a shock-resistant & IP67-rated water-resistant housing to withstand harsh & hazardous conditions.
Hands-Free Operation: Lightweight and compact, this carbon monoxide monitor includes a rugged steel clip and lanyard loop that allow for hands-free attachment to your gear ideal for home inspectors, firefighters, EMTs, and other professionals.
Long Battery Life: Built for long-term use with minimal maintenance, this portable CO monitor offers up to two years of battery life. The CO alarm features an intuitive interface with a large, clear LCD that displays CO readings from 1 to 1,999 ppm.

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Main Highlights

Professional-Grade CO Detection: Equipped with advanced electrochemical sensor and proprietary embedded software, this portable carbon monoxide sensor (INS-CO-03) delivers accurate, reliable readings of CO concentrations in parts per million (ppm).
Triple Alerts for Safety: With a 24-hour TWA and adjustable alarm levels, this portable CO detector lets you set alarm points from 1 ppm to 500 ppm, triggering visual LED indicators, 8085 dB audible alerts, and vibrating alarms at key thresholds.
Intrinsically Safe Build: Designed to ensure reliable performance in potentially explosive environments, this handheld carbon monoxide detector features a shock-resistant & IP67-rated water-resistant housing to withstand harsh & hazardous conditions.
Hands-Free Operation: Lightweight and compact, this carbon monoxide monitor includes a rugged steel clip and lanyard loop that allow for hands-free attachment to your gear ideal for home inspectors, firefighters, EMTs, and other professionals.
Long Battery Life: Built for long-term use with minimal maintenance, this portable CO monitor offers up to two years of battery life. The CO alarm features an intuitive interface with a large, clear LCD that displays CO readings from 1 to 1,999 ppm.

8.6

Very Good

PUTECCH

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

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Main Highlights

HIGH QUALITY CARBON MONOXIDE DETECTOR - The portable carbon monoxide meter is made of high-strength ABS material, which is sturdy and durable. High-precision electrochemical sensor can more quickly and accurately monitor the CO concentration in the surrounding environment.
EASY TO USE - Install the battery, long press the power button to turn on the handheld CO monitor and wait 28 seconds to warm up. You can press the Hi button to adjust the screen brightness, and press the "Lo" button to turn on or turn off the alarm.
LCD DISPLAY AND AUDIO ALARM - The 1.1inch LCD screen displays the real-time CO concentration from 0 to 999 ppm, buzzer status and battery level. When the CO concentration exceeds the specified level (50 ppm), the entire screen will turn red and a loud audible alarm will sound. When the battery voltage falls lower than the working voltage, the device will sound an audible alarm of "di-di-di" every minute. After the fifth alarm, the device will automatically turn off.
BATTERY POWERED AND POWER SAVING MODE - This pen-type CO detector is powered by 2x 1.5V AAA batteries (package includes). In order to save battery life, the carbon monoxide alarm detector will automatically turn off the screen backlight and enter power saving mode after about 1min of no operation. NOTE: In power saving mode, the gas sensor continues working and monitoring the carbon monoxide concentration. You can press any button to light up the screen again.
WHAT YOU WILL GET - 1x PUTECCH HD07 Battery Operated CO Detector, 2x AAA Batteries, 1x User Manual and 1x Lanyard Ring. Please feel free to contact us if you have any questions or concerns. We provide 12-month product service and lifetime technical support.

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Main Highlights

HIGH QUALITY CARBON MONOXIDE DETECTOR - The portable carbon monoxide meter is made of high-strength ABS material, which is sturdy and durable. High-precision electrochemical sensor can more quickly and accurately monitor the CO concentration in the surrounding environment.
EASY TO USE - Install the battery, long press the power button to turn on the handheld CO monitor and wait 28 seconds to warm up. You can press the Hi button to adjust the screen brightness, and press the "Lo" button to turn on or turn off the alarm.
LCD DISPLAY AND AUDIO ALARM - The 1.1inch LCD screen displays the real-time CO concentration from 0 to 999 ppm, buzzer status and battery level. When the CO concentration exceeds the specified level (50 ppm), the entire screen will turn red and a loud audible alarm will sound. When the battery voltage falls lower than the working voltage, the device will sound an audible alarm of "di-di-di" every minute. After the fifth alarm, the device will automatically turn off.
BATTERY POWERED AND POWER SAVING MODE - This pen-type CO detector is powered by 2x 1.5V AAA batteries (package includes). In order to save battery life, the carbon monoxide alarm detector will automatically turn off the screen backlight and enter power saving mode after about 1min of no operation. NOTE: In power saving mode, the gas sensor continues working and monitoring the carbon monoxide concentration. You can press any button to light up the screen again.
WHAT YOU WILL GET - 1x PUTECCH HD07 Battery Operated CO Detector, 2x AAA Batteries, 1x User Manual and 1x Lanyard Ring. Please feel free to contact us if you have any questions or concerns. We provide 12-month product service and lifetime technical support.

8.3

Very Good

Kidde

Kidde Carbon Monoxide Detector, Plug In Wall with 9-Volt Battery Backup, Digital LED Display

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Main Highlights

Easy Installation - simply plug-in to a standard, 120V outlet in your home
9-volt battery backup provides protection during a power outage
Digital LED display shows the level of carbon monoxide the CO alarm is sensing
85-decibel alarm announces when carbon monoxide is detected
Peak Level Memory records the last time carbon monoxide was detected or when the unit was last tested

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Main Highlights

Easy Installation - simply plug-in to a standard, 120V outlet in your home
9-volt battery backup provides protection during a power outage
Digital LED display shows the level of carbon monoxide the CO alarm is sensing
85-decibel alarm announces when carbon monoxide is detected
Peak Level Memory records the last time carbon monoxide was detected or when the unit was last tested

8.1

Very Good

Testo

testo 317-3 I Carbon Monoxide Detector I Portable ambient CO Meter for gas leaks with adjustable alarms

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Main Highlights

Efficient: The flue gas meter achieves the accurate readings needed for furnace and boiler service and maintenance, as well as weatherization audits and home inspections
Easy operation: Automatic zeroing, a range of up to 1,999 ppm and an exclusive self-check provide quick and worry-free CO measurements - without the need for test gas
Reliable: Visual and audible alarms with an programmable high and low alarm threshold warn the user effectively about potentially harmful CO concentrations
Compact: Thanks to the compact design, quick start and belt clip soft case, the lightweight carbon monoxide detector stick offers an easy and hands-free application
Accessories: The batterie powered flue gas detector comes with a protective soft case and clip belt, along with a hand strap and earbuds for loud working environments

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Main Highlights

Efficient: The flue gas meter achieves the accurate readings needed for furnace and boiler service and maintenance, as well as weatherization audits and home inspections
Easy operation: Automatic zeroing, a range of up to 1,999 ppm and an exclusive self-check provide quick and worry-free CO measurements - without the need for test gas
Reliable: Visual and audible alarms with an programmable high and low alarm threshold warn the user effectively about potentially harmful CO concentrations
Compact: Thanks to the compact design, quick start and belt clip soft case, the lightweight carbon monoxide detector stick offers an easy and hands-free application
Accessories: The batterie powered flue gas detector comes with a protective soft case and clip belt, along with a hand strap and earbuds for loud working environments

8.1

Very Good

HAKINAKU

HAKINAKU Travel Carbon Monoxide Detectors 3-in-1 Mini Size Portable CO Detector with Kickstand & Lanyard Built-in 120h Battery [CO Temp Humidity Sensor] for Travel Camping RV Hotel Safety (Orange)

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Main Highlights

Mini design with hanging lanyard This 3 in 1 Carbon monixide detector is mini design with dimensions: 3.3 x 2.0 x 0.66 inches. It is so convenient to carry it or hang it to anywhere
Built-in 120h 1000 mAh rechargable battery & new power-save mode To extend the CO detector's working time, the backlight will turn off when there is no operation or alarm signal, but the detector still continue detecting CO per 2s. The audible alarm will sound "di" every minute when battery is low power. New power-save mode helps to improve the ful charged detector working time to 120 hours.
Larger detection range CO range: 0 to 1000PPM; Humidity range: 0% to 95%RH; Temperature range: -4 to 140 . The cycle alarm works when the CO is over 50ppm.
Electrochemistry working method More accurate detection of carbon monoxide. There is no delay, real-time monitoring, and data is refreshed every 2 seconds shows on the color HD 1.9 screen, so that you can always know the air quality of the environment.
Portable Designed Perfect for outdoor and indoor activities, camping tents, boats, aircraft, stove heating, vehicles, and other confined spaces. It is so good helper for you.
How to test it ? Carbon monoxide is generated in incomplete combustion and dense smoke. We can take it close to a cigarette or burning paper that produces thick smoke. The CO concentration will change and show on the screen. Don't test it by car exhaust or airy place, too low CO consentration can't not trigger sensor to work.

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Main Highlights

Mini design with hanging lanyard This 3 in 1 Carbon monixide detector is mini design with dimensions: 3.3 x 2.0 x 0.66 inches. It is so convenient to carry it or hang it to anywhere
Built-in 120h 1000 mAh rechargable battery & new power-save mode To extend the CO detector's working time, the backlight will turn off when there is no operation or alarm signal, but the detector still continue detecting CO per 2s. The audible alarm will sound "di" every minute when battery is low power. New power-save mode helps to improve the ful charged detector working time to 120 hours.
Larger detection range CO range: 0 to 1000PPM; Humidity range: 0% to 95%RH; Temperature range: -4 to 140 . The cycle alarm works when the CO is over 50ppm.
Electrochemistry working method More accurate detection of carbon monoxide. There is no delay, real-time monitoring, and data is refreshed every 2 seconds shows on the color HD 1.9 screen, so that you can always know the air quality of the environment.
Portable Designed Perfect for outdoor and indoor activities, camping tents, boats, aircraft, stove heating, vehicles, and other confined spaces. It is so good helper for you.
How to test it ? Carbon monoxide is generated in incomplete combustion and dense smoke. We can take it close to a cigarette or burning paper that produces thick smoke. The CO concentration will change and show on the screen. Don't test it by car exhaust or airy place, too low CO consentration can't not trigger sensor to work.

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