SwitchBot CO2 detector with Built-in Hygrometer, Temperature Humidity Monitor with carbon dioxide monitor, Bluetooth CO2 Monitor, 2-Year Data Storage, SwitchBot Hub Required for WiFi Function

I bought this on the recommendation of a friend who also works from home and told me that I should probably be more concious of the CO2 in my front room where I spend most of my working hours. I set this up and had everything working within minutes, which was really easy. The app was easy to use and get everything set up to UK temperature and date format. First off, the detector unit is weighty but not heavy which is reassuring that it is of a good quality. The actual monitor itself has two primary modes, powered and unpowered, which for most will only effect how often the CO2 reading updates. In the case of powered, as low as every 30 seconds, and in the case of unpowered, every 20-30 minutes. The reading is displayed clearly on the screen so you can see it from across the room, alongside some other data like the time, date, temperature and humidity of the room. The data seems pretty accurate but you'd be surprised quite how much these variables change in a space as small as a room. I have another temperature/ moisture sensor on a shelf on the other side of my office about 1.5m up on the wall and it (as expected) reads slightly colder compared to the Switchbot unit which is next to my PC and workstation which will naturally be much warmer. There's probably something to be said as well about where specifically you put it in the room effecting the reading since CO2 is one of the more dense molecules in air, wet air clings to the ground and hot air rises so all the readings will vary slightly even in the same room - that's all normal and to be expected. I manage battery life by having it powered by my PC computer, so when I'm working the unit is powered and the CO2 readings update every minute, but when I'm not working it only updates twice an hour. No issues on battery life at all so far. Overall I am tremendously happy with this and would definitely recommend especially if you (or multiple people in your household) work from home and want to monitor the CO2 levels.

Works well and I have the data picked up by home assistant, the CO2 is updating very regularly which is essentially why I have this. This allows me to make decisions to open windows as needed for good internal health. I have three types of CO2 sensor in the house. Tado - this only updates every 30 minutes. Switchbot with 1 minute update in comparison easily wins here. ESPHome based self assembled and coded. This is nice, but sourcing components and writing code takes a lot of effort. Switchbot while slightly more expensive also wins here for simple ease of use and getting up and running immediately. Overall the CO2 monitor from Switchbot is my preferred option. Note first unit sent was faulty and would not correctly detect CO2 levels, however was able to easily return and obtain another via Amazon.

Great product, operates well and integrates into Home Assistant smoothly. The CO2 readings are fascinating and give a real insight into the ventilation effectiveness in the flat. Only drops a star because the first unit was faulty - the reading after plugging it in jumped up by around 200+ ppm, then back down again on battery power. The support process was slow with inane questions and pointless troubleshooting despite the obvious problem, but after about 3 weeks a replacement did arrive and this works perfectly.

Why I bought it I bought this mainly to monitor air quality in my home office. When you spend a lot of time in a closed room, CO₂ levels can build up without you realising, which can affect concentration and general comfort. I also liked that this device measures temperature and humidity in addition to CO₂, so it replaces a couple of separate sensors. Setup and installation Setup was simple. The device connects to the SwitchBot app via Bluetooth and was recognised quickly after installing the batteries. The app lets you configure alerts and view historical data. The monitor can sit on a desk or shelf, or be wall mounted. The screen is large and easy to read, showing: - CO₂ level - Temperature - Humidity - Time - Comfort indicators Everything is visible at a glance without needing to open the app. Accuracy and performance The device uses an NDIR CO₂ sensor, which is typically used in more accurate air quality monitors. In normal outdoor air it reads around 400–450 ppm, which is what you would expect. In my home office I noticed CO₂ levels rise quite quickly once the door is closed and windows are shut. After about an hour of working, levels can go above 1000 ppm, which is a good reminder to open a window and improve ventilation. Temperature and humidity readings also seem accurate and match another thermometer I have in the room. App and smart home integration The SwitchBot app is straightforward and allows you to: - View historical sensor data - Set alerts if CO₂, humidity, or temperature exceed limits - Integrate with other SwitchBot devices If you have a SwitchBot Hub, you can also enable remote monitoring and smart home automation. Build quality and display The device feels well built and the screen is one of the best features. The large display makes it easy to quickly see if air quality is good or if ventilation is needed. Battery life should also be good since it uses AA batteries, although it can also be powered via USB-C. Pros - Accurate NDIR CO₂ sensor - Measures CO₂, temperature, and humidity in one device - Large and clear display - Simple setup with the SwitchBot app - Useful alerts for air quality Cons - Hub required for full smart home functionality - More expensive than simple humidity sensors Final verdict Overall this is a very useful device if you want to keep track of indoor air quality. It’s particularly helpful for home offices, bedrooms, or children’s rooms, where ventilation can sometimes be overlooked. The clear display and accurate readings make it easy to see when it’s time to open a window, and the additional temperature and humidity monitoring is a nice bonus.

Really opened my eyes as to how high co2 levels can get when sleeping in a closed room. I left it outside for a few hours to check if it was working as expected and it measured the standard co2 levels you would expect outside. One thing to note is the co2 monitor updates very infrequently if on battery mode. When plugged in it updates aver 30 seconds. I noticed when I was sleeping co2 can get as high as 3500ppm which is incredibly high and can cause headaches and lead to grogginess waking up. This monitor is great to measure indoor air quality and has helped my sleep a lot. One thing to note is that if you want to access the co2 readings from your phone remotely, you will need the switchbot hub which is a bit annoying.

I got this CO2 Detector for a few weeks now to monitor air quality in my kitchen, and it’s been a game-changer. The CO2 readings are spot on, and the app makes it easy to track trends. You get instant alert notification on your phone and the device bips as well if CO2 level increases. It does work! Tested with a water carbonator machine next to this device and each time I use the carbonator the CO2 sensor bips lol! Great purchase. So far so good! Update after 1 year using it: After a full year of continuous use, I’m pleased to confirm that this CO₂ detector and environmental monitor continues to perform reliably and fully justifies my original 5-star rating. Installed in a frequently occupied indoor space, it has provided consistent, actionable insights into air quality, temperature, and humidity. Over 12 months, readings have remained stable and credible when compared with other reference devices. CO₂ levels respond quickly to occupancy changes and ventilation adjustments, making it easy to optimise airflow. The temperature and humidity sensors also track seasonal changes accurately, helping maintain a comfortable and healthy indoor environment. The historical data feature has proven particularly valuable. Being able to review trends over weeks and months helps identify patterns such as winter humidity drops or elevated CO₂ during colder periods when windows stay closed. This insight supports practical decisions like adjusting ventilation schedules or using humidifiers more effectively. Battery performance has met expectations, requiring minimal intervention over the year. The device remains low maintenance, with stable Bluetooth connectivity and dependable data logging. Integration with a hub for remote monitoring continues to function smoothly, allowing checks while away from the property. The unit still looks and feels well built, with a clear display that remains easy to read. The compact design blends unobtrusively into the room. Setup and daily operation remain straightforward, making it suitable for both tech-savvy users and those seeking a simple air quality solution. After a year, its value extends beyond simple monitoring. It supports healthier living conditions, improved sleep environments, and more efficient heating and ventilation management. For home offices, bedrooms, or rental properties, it continues to provide meaningful insights that can enhance comfort and wellbeing. This long-term update confirms the device’s durability, accuracy, and usefulness. It remains a dependable tool for monitoring indoor air quality and environmental conditions, and I would confidently maintain my 5-star recommendation.

The SwitchBot Air Quality Monitor has been a fantastic addition to my smart home setup. Its 5-in-1 functionality is incredibly convenient, providing detailed readings for temperature, humidity, CO2 levels, and more—all in one glance. I especially appreciate the multi-point monitoring feature, as it lets me track both indoor and outdoor conditions. The app alerts are very useful, notifying me when levels go out of range even when I'm away. Setup was easy, and the air quality monitor seamlessly integrates with the other Switchbot products like the Smart Humidifier. It can be wired or used wirelessly and charged which is super convenient. Highly recommend!

Cool gadget, enjoying the data, app sometimes freezes unexplainably but aside from that it is doing a good job

Déjà adepte des produits Switchbot, je possède pas mal de leur produit (thermomètre, hub, télécommande, aspirateur...). Et je ne suis encore une fois pas déçu par celui-ci : l'installation et la configuration s'est faite en 30 secondes environ : on retire la languette en plastique qui coupe l'alimentation des piles de type LR6 (fournies !), on lance la recherche via l'appli, on appuie sur le bouton de l'appareil 2 secondes et.... c'est tout. Pensez à activer le bluetooth de votre téléphone avant par contre. L'heure se synchronise toute seule quelques minutes après. Il y a une option dans les réglages pour activer ou non la synchro automatique, ainsi que l'affichage en mode 24h. Vous pouvez choisir une autre source pour l'affichage de la température / humidité si vous avez d'autres thermomètres de la marque, mais aussi la température extérieure. Pour cette dernière, il faudra tout d'abord vous rendre dans les paramètres de votre maison et renseigner votre adresse. La mise à jour des données est réglables en fonction de vos besoins, sachant que plus la fréquence de mise à jour est élevée, moins la batterie tiendra longtemps. Pour le CO2, c'est 30 minutes sur batterie, ni plus ni moins. Vous avez cependant la possibilité de brancher l'appareil avec un câble USB-C, fourni lui aussi. Attention à ne pas le perdre, car l'emplacement pour le brancher ne permet pas d'utiliser une fiche trop longue et donc certains câbles pourraient ne pas être utilisables. Et dans le cas d'un branchement par câble on peut tomber à une fréquence pour le CO2 de 1 minute. L'écran présente toutes les données de manière claire et exhaustive : Prévisions météo, heure, date (au format mois/jour, une petite amélioration en vue pour les français), mesure de CO2 et son niveau (mauvais, moyen, bon), la température, l'humidité et le niveau de confort (sec, confort, humide). Les valeurs de ces niveaux sont réglables dans les paramètres de l'application. Concernant celles-ci, elles donnent accès à un nombre de données assez impressionant, et vous pourrez retrouver l'historique des derniers jours, mois, années. Pour positionner l'appareil, 2 possibilités : posé sur une table, la béquille offre 2 positions, 90° et environ 45°. Sinon via un trou pour le suspendre à une vis. Contrairement à ses habitudes, Switchbot n'a pas inclus de double face 3M. Mais bon il ne tient qu'à vous d'essayer. Un dernier point concernant l'intégration avec les systèmes Smart Home. Il vous faut obligatoirement un Hub de la marque pour communiquer avec les différents assistants via Internet. J'en utilise 3 : Google Home, Alexa, et Home Assistant. - Google Home : aucun souci, mes comptes était déjà liés, l'appareil a été automatiquement ajouté. Il remonte bien les 3 infos principales: température, humidité, CO2 - Alexa : pour le coup, j'ai un appareil Alexa depuis peu, c''est la 1ère fois que je l'utilisais, je l'ai fait uniquement pour les besoins de cet avis, et franchement c'est pas fou. L'association des comptes est plutôt simple, en revanche, les infos remontées sont... pauvres : seulement la température. J'ai pu regarder un peu le reste des appareils que j'avais déjà et c'est pareil pour tout : seulement la température. Le détecteur de fuite d'eau ? son statut est "fermé". Faudra m'expliquer ce que ça veut dire exactement, Google, lui, m'indique bien "Pas de fuite". Bref, je n'utilisais pas Alexa, et je vais continuer. - Home Assistant : toujours un peu plus compliqué car c'est beaucoup moins facile d'accès, mais Switchbot fournissant une API et y ayant très récemment ajouté le Meter Pro CO2, il ne m'a pas fallu longtemps pour l'intégrer à Home Assistant. Très content de la rapidité et efficacité de Switchbot sur ce coup, ce qui n'est pas toujours le cas. En résumé : c'est quand même un peu cher, mais la qualité et la simplicité est au rendez-vous, comme toujours !!

Parfait

Requires a cell phone with Bluetooth capability, a downloaded app, and a free account with Switchbot in order to set the unit up. There are virtually no instructions provided - you have to explore the app to see what can be customized. Be sure to poke around in the app to find where you can update the device firmware, a process that works quite simply. You can also select the time interval for temperature and humidity and CO2 measurements (5, 10 or 30 min) and whether or not pressing the top button switches from Celsius to Fahrenheit. The meter can run off house power, and a USB cable is supplied; however, you will need to provide your own power source. The meter seems to run quite fine on batteries, so try it out this way first. The meter has sensors for CO2, temperature, and relative humidity. The app additionally calculates and shows absolute humidity (grams water per cubic meter), dew point, and vapor pressure deficit (a parameter which is apparently important in greenhouse operations). Data points are recorded by the device as they are generated. When you connect to the device by Bluetooth, the data are downloaded to the app and shown on a graph with a selectable time axis of hours, days, weeks, months, or years. I purchased the meter as a standalone - as such, it is connected by Bluetooth to my phone, but has no internet connection. You can have 2 or more meters running off the same app, each with their user-defined name such as MASTER BEDROOM. I was surprised by how sensitive the monitor is to CO2. If someone enters a room or turns on a gas range, within a few minutes the meter will pick up the increase in CO2. If a house has been occupied for a while and then is vacated, the CO2 level gradually drops. The rate of drop gives some indication of how rapidly outside air is entering the room through the building envelope. If you apply some mathematics, it is possible to calculate natural air changes per hour for a room (for instructions, query AI agents). I had a problem with the meter shipped to me, but Customer Service and Support was excellent. After a series of quick turn-around email exchanges, I was sent a new meter. The image shows CO2 levels in my kitchen. The level is flat around 400 ppm overnight - this is essentially the same as outside air. The CO2 then spikes to 650 ppm when I used a single burner on a gas range to fry a couple of eggs. The second spike to over 700 ppm is a family member who used the gas range to heat a can of soup.

Werkt echt goed. Het is wel nodig om hem ( liefst ) buiten te calibreren. Anders geeft hij te weinig aan. Maar dat is niet erg, want dat is zo gebeurd.

good and exact