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 as I was concerned about CO2 levels in my home office, particularly in winter when the windows tend to be shut and the door is shut during meetings. I'd been feeling quite drowsy in the afternoons and wondered whether this had something to do with CO2 levels. It sits on my desk and displays temperature, humidity and CO2 levels. I've quickly realised how fast the CO2 levels rise in my small office when I'm in meetings and it's a really good prompt to crack open a window and refresh the air. I'm an avid home assistant user and this integrates well. You need the switchbot app to setup initially but I haven't bothered with a switchbot hub as home assistant picks up it's bluetooth (you need a device to act as a bluetooth proxy e.g. pretty much any ESP32 device, a Shelly relay etc). In Home Assistant it was detected automatically and I get readings for - temperature and humidity (I think these are updated every minute), - CO2 PPM which is updated ~25min, - battery level I've no idea how accurate the CO2 PPM is as I've got nothing to compare it to, but I don't need it to be calibrated, I'm just interested in the trends (normal ventilated room is between 400 and 700, stuffy office with door close is >1200) The size is good and it comes with a kick-stand for sitting on your desk but there's also a slot for mounting on a screw or picture hook if you want it on the wall. The device feels solid - not flimsy at all and the display is crystal clear and a really good size. The device can be powered by USB-C or battery. I've had it running on my desk for about a month and the provided batteries are still showing 100% CO2 monitors aren't cheap, but I was quite happy to pay £55 for this and consider it good value for money

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!

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.

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.

Easy to set up, informative. Let me know time to open the living room door to reduce CO2 level.

Precise and reliable. Tested it with other devices and this item was the only keep. Not only because it provided accurate readings, but the phone connectivity is also excellent for calibration to historical data. Great value for the money.

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. The device won't be detected and installed in the app unless you use the "add manually" option, finding the device in a long list of other devices by the same company. 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 measurements and whether or not pressing the top button switches from Celsius to Fahrenheit. Contrary to the Amazon web page, CO2 is not measured every second. A CO2 measurement appears to require a significant amount of power and takes a few seconds. When the meter is running on battery, it will only make a measurement every 30 minutes, or when you press the button on top of the unit. The meter can run off house power, and a USB cable is supplied; however, you will need to provide your own power source. On house power, the CO2 measurement time can be as short as every 5 minutes. 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. Older data may easily be deleted from the device (perhaps after you have exported it). I purchased the meter as a standalone - as such, it is connected by Bluetooth to my phone, but has no internet connection. Probably there is internet access to the device if it is part of a SwitchBot network. 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. 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.

good and exact

Seems to be accurate, looks nice and has a good app which is tracking the data.