Airthings 325 Corentium Home 2 vs Aqara TVOC Air Quality Monitor

The Airthings 325 Corentium Home 2 is the better overall choice. It wins on owner rating, its 5-year warranty, roughly 3-year battery life and connectivity, and it is a dedicated radon monitor. The Aqara TVOC Air Quality Monitor is cheaper and supports more platforms including Apple HomeKit, but it tracks VOCs, not radon, and needs a Zigbee hub.

The sensor each is built around. The Airthings 325 Corentium Home 2 is a radon detector that also reports temperature and humidity, while the Aqara TVOC Air Quality Monitor measures TVOCs (airborne chemicals) with temperature and humidity and has no radon sensor. Only the Airthings answers the radon question.

Both have an on-device screen: the Airthings 325 Corentium Home 2 uses an LCD with simple Good, Fair or Poor indicators, and the Aqara TVOC Air Quality Monitor uses e-ink. The Airthings connects over Bluetooth (with an optional Airthings hub), while the Aqara is a Zigbee device that requires an Aqara hub to work.

The Airthings 325 Corentium Home 2 runs about 3 years on AA cells, versus roughly 1 year for the Aqara TVOC Air Quality Monitor's CR2450 cells. On alerts the Aqara documents temperature, humidity and air-quality notifications, a fuller set than the Corentium Home 2, whose main documented alert is for air quality.

Anyone who wants simple, continuous radon testing with clear readouts. The Airthings 325 Corentium Home 2 suits basements and radon-prone rooms, tracking a mitigation system, and buyers who want plain-language results, with a 5-year warranty and Google Home, Alexa, Home Assistant and IFTTT support.

Aqara or Apple HomeKit users who want a low-cost VOC, temperature and humidity sensor with an e-ink display. The Aqara TVOC Air Quality Monitor adds Apple HomeKit and more alert types, but it needs an Aqara Zigbee hub and does not measure radon at all.