Quick verdict
If you care about indoor air quality, this sensor covers temperature, humidity, and CO2 in one device with a clear e-ink display. It works with Home Assistant over Bluetooth or Matter via a Hub. The CO2 readings are useful for automating ventilation. Trigger a fan when levels climb. Not the cheapest option if you only need temp and humidity, but the CO2 monitoring justifies the step up.
Standout: Combined temperature, humidity, and CO2 monitor with e-ink display and Matter support.
Last checked: 2026-03-22