--- product_id: 522612658 title: "CO2 Carbon Dioxide Detector, Indoor Air Quality Monitor 4-in-1 Portable CO2 Monitor, Tester for Carbon Dioxide, Temperature & Relative Humidity, CO2 Meter with Alarm, for Home, Car, Grow Tents, Travel" brand: "langkou" price: "¥717" currency: JPY in_stock: false reviews_count: 8 url: https://www.desertcart.jp/products/522612658-co2-carbon-dioxide-detector-indoor-air-quality-monitor-4-in store_origin: JP region: Japan --- # Compact design 8-hour battery life Temperature & humidity CO2 Carbon Dioxide Detector, Indoor Air Quality Monitor 4-in-1 Portable CO2 Monitor, Tester for Carbon Dioxide, Temperature & Relative Humidity, CO2 Meter with Alarm, for Home, Car, Grow Tents, Travel **Brand:** langkou **Price:** ¥717 **Availability:** ❌ Out of Stock ## Summary > Breathe Easy, Live Smart! 🌬️ ## Quick Answers - **What is this?** CO2 Carbon Dioxide Detector, Indoor Air Quality Monitor 4-in-1 Portable CO2 Monitor, Tester for Carbon Dioxide, Temperature & Relative Humidity, CO2 Meter with Alarm, for Home, Car, Grow Tents, Travel by langkou - **How much does it cost?** ¥717 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/522612658-co2-carbon-dioxide-detector-indoor-air-quality-monitor-4-in) ## Best For - langkou enthusiasts ## Why This Product - Trusted langkou brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Portable & Convenient:** Take your air quality monitor anywhere with its lightweight design. - • **Versatile Applications:** Perfect for homes, offices, and travel—protect your loved ones wherever you go. - • **Advanced NDIR Technology:** Experience precise detection with cutting-edge sensor technology. - • **Stay Ahead of Air Quality:** Monitor CO2 levels in real-time to ensure a healthy environment. - • **User-Friendly Calibration:** Simple setup with automatic calibration for hassle-free use. ## Overview The CO2 Carbon Dioxide Detector is a 4-in-1 portable air quality monitor that accurately measures CO2 levels, temperature, and humidity. Featuring advanced NDIR technology, a colorful LCD display, and a built-in rechargeable battery, this device is essential for maintaining a healthy indoor environment at home, in the office, or on the go. ## Description Full description not available ## Features - Indoor CO2 Monitor: Compact size Body with hollow back design for carring and airflow. Big colorful LCD digital screen for people easy to identify and read. Not only monitoring the CO2 content, also can test the temperature & humidity. Air quality monitor is Keeper of family health, Perfect for home interior, such as living room, baby room, classroom, office and which closed places etc. - Necessity of Air Quality Monitor: Carbon dioxide (CO2) is not harmful to human body when it is low, but when it overs a certain amount, it will affect the breathing of humans (and other organisms). If serious, life is threatening. Thus, we have to monitor the CO2 content of air for keeping health. - Advanced NDIR Technology: Mini CO2 meter uses high precision NDIR sensor technology to detect carbon dioxide content accurately and quickly. and it can hazard assessment, when CO2 of air exceed the setting alarm value(alarm value: 1000 PPM), it will warn to remind people to open the window or turn on air purifier for keeping balance of air. - Air Semiconductor Sensor: 4-in-1 air quality monitor adpots intelligent air semiconductor sensor to test the temperature and humidity value of air. Compare with the common sensor, it is more sensitive, accurately and stable. - Convenient for Carrying: CO2 Monitor built-in 1600mAh battery. It can be used continuously for about 8 hours after full charging.So don't worry, take the CO2 meter to anywhere you want go. - Easy to Use: Each turn on, CO2 detector need to automatic calibration, so please put the air quality detector in a ventilated place, after 1-2 minutes calibrating, CO2 tester can be used normally. - Various Use: A air quality monitor is indispensable for a family. Help for detecting gas and air pollution in homes, kitchens, bedrooms, offices, schools, cars, hotels, travel, camping, parties, etc., to always protect you and your family under healthy air conditions. - Note: Dear customer, compare with other CO2 meters, please allow the differece (about ±50 ppm). After all, different CO2 meters adopt to different NDIR sensor, so their test result is exsit the difference. Thanks for your understanding. ## Product Details - **Brand:** Langkou - **Style:** Air Quality Monitor/ CO2, Temp, Humid - **Power Source:** Battery Powered - **Product Dimensions:** 1.38"D x 2.76"W x 3.15"H - **Item Weight:** 0.2 Grams - **Alarm:** Audible - **Operating Humidity:** 99 percent - **Sensor Type:** Non Dispersive Infrared - **Material:** ABS - **Manufacturer:** Langkou ## Images ![CO2 Carbon Dioxide Detector, Indoor Air Quality Monitor 4-in-1 Portable CO2 Monitor, Tester for Carbon Dioxide, Temperature & Relative Humidity, CO2 Meter with Alarm, for Home, Car, Grow Tents, Travel - Image 1](https://m.media-amazon.com/images/I/51IQnPn0+gL.jpg) ![CO2 Carbon Dioxide Detector, Indoor Air Quality Monitor 4-in-1 Portable CO2 Monitor, Tester for Carbon Dioxide, Temperature & Relative Humidity, CO2 Meter with Alarm, for Home, Car, Grow Tents, Travel - Image 2](https://m.media-amazon.com/images/I/71iiGVhwsqL.jpg) ![CO2 Carbon Dioxide Detector, Indoor Air Quality Monitor 4-in-1 Portable CO2 Monitor, Tester for Carbon Dioxide, Temperature & Relative Humidity, CO2 Meter with Alarm, for Home, Car, Grow Tents, Travel - Image 3](https://m.media-amazon.com/images/I/81eHl7NhbvL.jpg) ![CO2 Carbon Dioxide Detector, Indoor Air Quality Monitor 4-in-1 Portable CO2 Monitor, Tester for Carbon Dioxide, Temperature & Relative Humidity, CO2 Meter with Alarm, for Home, Car, Grow Tents, Travel - Image 4](https://m.media-amazon.com/images/I/71ujJ1qELRL.jpg) ![CO2 Carbon Dioxide Detector, Indoor Air Quality Monitor 4-in-1 Portable CO2 Monitor, Tester for Carbon Dioxide, Temperature & Relative Humidity, CO2 Meter with Alarm, for Home, Car, Grow Tents, Travel - Image 5](https://m.media-amazon.com/images/I/61KCfP0QHhL.jpg) ## Questions & Answers **Q: What value (number) represents an unsafe level of CO2?** A: Hi, when the CO2 concentration exceeds 1000ppm, you need to pay attention to indoor ventilation, at this time, the CO2 concentration is already high. When the CO2 concentration reaches 1200ppm, it means that the current air environment is relatively bad, making people feel tired and lethargic. When the CO2 concentration exceeds 2000, it means that the current air is seriously polluted. Hope this information can help you. **Q: Wow, that co2 monitor looks great, how do i turn off the alarm?** A: Dear customer, you just need to double click the button of CO2 Monitor quickly and hear a beep, it means the alarm has been turned off, double click again to resume **Q: What's the accuracy/margin of error of the CO2 measurement (not the resolution or range)?** A: Dear customers, please watch this video, we tell you in detail all the parameters of Langkou CO2 monitor and also provide the concentration range of CO2 and PM2.5 and their corresponding air quality conditions, any questions please ask us **Q: My pm reading is stuck on 999, even if i take it outside, even if i turn off/on. is it broken? is there a reset?** A: Hi, when you are testing the PM reading, is there any obvious smoke next to it? When someone smokes or there is dense smoke around, the PM index will rise rapidly. If the air around the device is in good condition, it is likely that a sensor failure has caused the PM reading to be too high. Please contact me through the Amazon mail system for more effective and timely communication. Log in to your Amazon account> select "your orders", search for the order number> click "contact seller". ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good, cheap, measure for "we should open a window / door". *by A***S on October 10, 2024* It's inexpensive, and I'm sure it's not incredibly accurate, but if you're looking for a cheap way to tell if the room you're in has too many people rebreathing each other's air, I'd say this is it. Very useful to demonstrate to me the reason to mask up on public transport, and to tell whether the meeting room I'm entering is going to put me into a deep sleep while simultaneously threatening my continued health. ### ⭐⭐⭐⭐⭐ Life changer *by K***客 on June 7, 2024* This product can monitor the CO2 concentration for a room which is a life changer to me. It provides indication to all the potential causes impeding the living quality of a room, directing you to solve the issues rapidly. ### ⭐ Ummmm trash *by K***R on December 16, 2023* I'm going to give the most honest review I can about this. It's ok at best because of a few reasons. First one is because it needs to be plugged into the charger consistently. You will only get about 18h of run time without it being plugged in. Secondly it's about + or - %10 inaccurate with its readings. Only reason I know this is because I have multiple different sensors just so I can verify the conditions at different points in the room. This one was the only one showing weird numbers so I lined all of them up next to each other for a day to see. All of the others shown similar numbers but this one was off by about %10 with everything, but the temperature was right tho. The co2 and humidity are off a bit because I have 3 other units that show similar numbers but this one doesn't. Plus it's delayed with its readings. I blew my breath behind all of them I has set up and this one just responded the worst. It took awhile to even detect more co2 in the air. I wouldn't buy this one again but to be fair my other units are 3x as much. I was being cheap when I got this SMH. I got it for a plant grow space but kind mad I didn't spend 20 more dollars on a better one. ## Frequently Bought Together - CO2 Carbon Dioxide Detector, Indoor Air Quality Monitor 4-in-1 Portable CO2 Monitor, Tester for Carbon Dioxide, Temperature & Relative Humidity, CO2 Meter with Alarm, for Home, Car, Grow Tents, Travel - Kidde Carbon Monoxide Detector, Plug In Wall with AA Battery Backup, Test-Hush Button - First Alert CO605 Plug-In Carbon Monoxide Detector with Battery Backup , White --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/522612658-co2-carbon-dioxide-detector-indoor-air-quality-monitor-4-in](https://www.desertcart.jp/products/522612658-co2-carbon-dioxide-detector-indoor-air-quality-monitor-4-in) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-11-02*