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

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.

The biggest win for me is seeing those CO2 levels start to climb. It's like a little nudge that reminds me, “Okay, time to crack open a window and get some fresh air circulating.” Before, I wouldn't have really known, but now I get that visual cue, which is brilliant.Beyond that, I found it pretty straightforward to get going with the app, and seeing the history is also helpful.

This provides values in line with other sensors i have. The update rate is quite slow on battery but fine when plugged in with the usb.It's well made and has a premium feel and looks good. The screen is clear It was easy to connect to Bluetooth.

Excellent, good well calibrated sensor, just works out of the box. It's well to remember that when using battery it only samples CO2 every 30mins Vs every 5 mins when plugged in. Also integrates well with Home Assistant!

Very precise, high quality as all Switchbot products.

When running on battery power, CO2 sampling rate is locked to once every half hour. This is probably done with good intentions to save power, but it's frustrating that the option to increase it is (likely artificially) disabled even if you're ok with trading off battery life. When running on USB C power then it does it every minute. Hopefully a future firmware update can lift this restriction.Otherwise the meter works well. The other annoyance is you're forced to create an online account before the app will allow you to connect to the local bluetooth device you bought, which seems totally unnecessary.

Great value, easy to use, and provides an excellent display of safety in our rooms.Very pleased with it.

It has been great! Well designed, and helps monitor temperature, humidity, and CO2. The app to sync and track the data is also great.