CO2 Detector, Air Quality Monitor Indoor, CO2 Monitor for CO2/TEMP/Humidity, Portable Carbon Dioxide Detector for Home/Car/Office/Greenhouse

Zero exaggeration but this device is amazing. Stumbled upon my house CO2 issue accidentally upon purchasing a BP04 for large TV room. That purifier unit has CO2 monitor that was reading dangerously high levels. Put the Switchbot CO2 monitor next to it and there was 0.61% difference between both readings being 1140 and 1147 respectively. Strongly recommend to purchase. I shared with coworkers after seeing how bad my indoor CO2 levels were. Pros: Extremely easy to use. Clear display. Has caching capabilities when used without a hub. Bluetooth can transmit between floors. Cons: Cannot think of any. This is one of the very few products I have purchased that did exactly what it was intended to do, extremely well, and without any possible improvements.

The SwitchBot Meter Pro CO2 Indoor Air Quality Monitor is an excellent tool for maintaining a healthy environment. Its 5-in-1 functionality provides real-time CO2 readings alongside temperature, humidity, and more, making it versatile for home or office use. The large display is easy to read, and the Bluetooth connectivity ensures seamless data tracking with 2-year data storage to monitor trends over time. This will save my home from potentially health issues. I paired it with the SwitchBot 4-in-1 Air Purifier, and they work perfectly together. The purifier’s H13 HEPA filter and aromatherapy feature not only improve air quality but also create a pleasant atmosphere. Its RGB lighting adds a stylish touch, and the combination ensures I can monitor and purify the air simultaneously. This duo is a fantastic investment for anyone prioritizing health and comfort.

Update - 7/3/25 - 4 stars Three weeks ago, SwitchBot reached out regarding my defective unit. After trying to resolve with no resolution, they sent me a new one. I have to say, their customer service is very good; they do stand behind their product. The reading now is much more accurate. I have been using it indoors without any readjustment. On average, it is 50~80 ppm differs from Aranet4. Perhaps it has to do with the different sampling rates between each other. I will be testing my aranet4 and switchbot outside and see if they read the control air in the same 400 ppm range. Perhaps one of them just needs a quick reset to the proper baseline. I am now changing from 2 stars to 4. Will update to 5 stars if all stays the same for another couple of months. I think I was just unlucky the first time. Original Review - 6/3/25 - 2 stars Well designed, big screen, and USB C minute detector is just awesome. I had it setup next to my aranet4, the first few days both were right on the mark. However just a week later, the switchbot is off by 400 ppm!!! I thought how can it be, it must be my aranet4 needing recalibration. So I borrowing my friend’s aranet4 to see what is going on, the two aranet4 were less than 20 ppm from each other… I think the real issue is the SwitchBot. I am really disappointed and really wanted to get something reliable and costs less. How can I trust the reading if I need to recalibrate every week. Perhaps switchbot still have bugs need to work out, or maybe I got a lemon. It is hard to trust something new out of the box needing recalibration so quick.

I tested it for accuracy and am very happy. I will now use and trust it. I got the best results exhaling on the right side. In the application push the refresh button next the carbon dioxide levels, and it will show the results usually in about thirty seconds or less. I started exhaling and then pushed the button. The longer you hold your breath before the test the more carbon dioxide will be shown on the monitor. I also tested it outside. I do not live in a city. The normal outdoor carbon dioxide levels should be approximately 400 to 450 parts per million. I don’t need to compare this monitor to any others. Because, the outdoor levels on earth are a known fact. Super happy this wasn’t junk. If I want notifications on my telephone, I need to buy their hub. It’s $50. But, I could be anywhere and get an alert for any of the various options available in the settings. Alerts are shown when you open the application. But, that’s too late for me. So, for now I have them turned off. / On battery power the lowest carbon dioxide check is every five minutes. But, you can push the refresh button in the application to instantly check. I like the application and the ability to monitor everything over time. I need that function. Scrolling over the graphs can be done on the graph, and below it, on the time. The instructions were helpful. Update: #1 The measurement of carbon dioxide stops randomly for several hours at a time, as mentioned by other reviewers. It will stay locked on a number, and in the application show the same number for several hours. This has happened several times. I have reset the device, I have recalibrated the device, and I have removed the device in the application, as well as reinstalling the application, several times. It will work fine briefly. Then just get stuck and show the same reading for several hours. Tips: The update interval can be changed while on battery power. To change the update interval for being plugging in, you have to plug it in. The temperature on the display does not change to Fahrenheit, regardless of changing it in the application. You have to go to the settings, under Top Button Function, and select "Pressing the top button will switch the temperature unit". Then press the top button once. The instruction manual says that if you do a calibration to do it on battery power. Also, it should be done outdoors. The carbon dioxide readings can be taken every five minutes on battery power and every one minute while plugged in. They can be taken more often while plugged in. But, that is not recommend. Due to possible heating up of the device. Which, may effect readings. The humidity and temperature can only refresh at the most, every five minutes. The application often does not show the latest readings, even after refreshing or closing and reopening. Usually, it will be behind by several minutes, and will eventually, randomly show the latest data. Also, after refreshing or opening the application it does not default to the latest readings on the graphs. So, every time you have to scroll for an unreasonable amount of time to get to the latest data. Plus, the scrolling and interaction of the graphs is glitchy and not consistent. I don't want to pay for the Aranet4. But, it appears to be the only choice for a small device like this, that functions correctly. AirGradient is a larger device. But, it has won awards and is accurate. That one is $230, and $138 if you assemble it yourself. Update: #2 The company reached out to me after my review. I am revising my review back to 5 stars. Because, even though everything I said before is true, the malfunction of the reading of carbon dioxide “freezing” or stopping and the unit not taking any measurements for hours randomly or forever, only happens while the unit is plugged in. While, on battery power I have had no problems. But, the carbon dioxide measurement frequency is limited to every five minutes on battery power. That is not a super big deal. Considering, that I also have an Aranet 4, and both units have the lowest possible measurement frequency for humidity at five minutes. Both units are in basic contexts exactly the same. A few numbers here and there is nothing. Plus, the units often match nearly identically. But, for graphs and checking over hours, days and weeks, they are for the most part, the same. Not any jumps, or differences like that. I would prefer the carbon dioxide to be measured every minute. In the Switch Bot application, while in battery power it even offers to go more frequent in the measurements, down to seconds. Though it recommends against it due to possible heat that may affect readings. For less than half of the price of the Aranet 4 and basically near equal performance, I think this is a good option. I do not however know about the longevity of the product. But, customer service was great. No questions asked. Money back. I did just discover the situation about the unit only working for me consistently on battery power after they contacted me. So, I waited for the money to clear before writing this update. I get to keep the unit. I like it. Mine, just was not working correctly while plugged in. I think it’s personal preference and how much you want to spend. In my opinion there is basically zero difference between this Switch Bot and the Aranet 4. The Aranet 4 is smaller, and on battery power can measure carbon dioxide once a minute. But, that is not big factor for many. Still, important for some. My plan was to use a little external battery pack to get the one minute readings. But, in general most people don’t need readings every minute. I don’t. So, super happy. Thank you, Switch Bot. Update: #3 Showing a comparison of three devices. One only tests humidity and temperature. The white background photographs are the Aranet 4. The Aranet 4 is the best application by far. It can go in landscape and can be zoomed-in on. The examples show the accuracy of the device with humidity and carbon dioxide. Also, the zooming-in is a nice feature. But, it is not necessary and not very relevant to many. The tracking over time is basically the same as the Aranet 4, and that device is a lot more. The nicer application of the Aranet 4 is great. But, I don’t know if it’s worth 3 times the price of the Switch Bot. Zero problems for me when running on battery power. No “freezes” of monitoring in a week. Plugged-in I would get random “freezes” any day or night, for hours or forever. A different Switch Bot may be fine. I personally would buy the one with the best application if I was rich. I’m not. The application is the reason why I bought this device and it does what I need well enough. To monitor trends, changes over time, and to reference anything back to the data in the graphs.

$69 with a 30% off coupon is a great price! They used the industry's best NIDR sensor for CO2 readings. I don’t have a Hub, but the setup is simple. I added it to Home Assistant via Bluetooth, and it works perfectly. I am comparing it to the Aranet4 for accuracy, and the readings are similar, with less than a 50 ppm difference between them. I have included a comparison graph for your reference; the yellow line represents the Switch Bot, while the blue line represents the Aranet4. The only downside is that when running on battery, the CO2 reading is recorded every 30 minutes, but when plugged in with a USB-C power cable, the readings occur much more frequently. Overall, I am happy with my purchase and plan to buy more units for each bedroom.

This little sensor display is well built, easy to read if there’s any light on at all (difficult to read in the dark), and works great with home assistant. Highly recommend!

I have various other models and this is my favorite CO2 detector for Home Assistant!

Yet another smart home ecosystem that is half baked in regards to advertised integrations. Pros: - The CO2 sensor looks elegant and is accurate Cons: - CO2, temperature and humidity sensor data, can't be used to trigger automations in Alexa (e. G. Turn on fan if CO2 exceeds 1000ppm). Alexa also doesn't have access to all data (e.g. CO2, humidity and only the temperature is available). Why don't you clearly state in your product description that this is just a partly working Alexa integration? - Outdoor sensor is losing connection since the gazebo is too far (no signal strength indicator in the app to make it easier to find the right placement). No indicator that teh connection is lost and instead there are just no updates in the app. We live in California and houses are thin, I would have expected a longer distance. - Initial hub update failed twice as it just gut stuck even though the phone was right next to it. Frustrating from the beginning. - The mobile app isn't good. It suddenly stopped showing historical CO2 data while temperature still shows up. It almost defeats the reason for a connected device and instead I can just get a cheaper standalone device. There is also no attention to detail where the max CO2 value shown is lower than the highest reading in the graph. Someone should QA this. Vendor reached out about the experience. Updating my review to 3 stars. I'll update to 5 once the main issues are resolved.