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At a glance
- Type
- Continuous monitor, battery, alpha spectrometry
- How it measures
- Alpha spectrometry, passive diffusion chamber
- First reading
- Not stated by the manufacturer
- Reading updates
- Samples radon every 60 minutes; shows 24-hour, 7-day, 30-day and long-term averages
- Display and app
- Built-in display, phone app, Bluetooth
- Power
- Battery: 2 AA batteries, included
- Units
- pCi/L by default; Bq/m³ selectable
- Price
- Not shown. We print a price only from Amazon's live product data, with the time it was checked, and that feed is not connected yet.
What it is and how it works
Airthings describes the radon sampling as a passive diffusion chamber and the detection method as alpha spectrometry. Air drifts into the chamber without a fan or pump, and the sensor samples radon every 60 minutes. The 2024 comparison in Sensors lists the same principle for an Airthings monitor it tested, the View Plus: a photodiode with alpha spectrometry.
Airthings publishes a measurement range of 0 to 250 pCi/L, or 0 to 9,999 Bq/m³. The device is set to pCi/L for radon and °F for temperature by default, and a Units button inside the back cover switches it to Bq/m³ and °C. Temperature and humidity are sampled every 5 minutes.
The screen is built around averages rather than a live number. After 30 days it offers six views: 24-hour, 7-day, 30-day and long-term radon averages, with the long-term average covering up to a year, plus temperature and humidity. A touch button below the screen steps through them, and after 5 minutes of inactivity the screen returns to the long-term radon average.
The Corentium Home 2 works on its own with no wireless connection at all. Bluetooth links it to the free Airthings app for graphs and guidance, and Airthings SmartLink can connect it to an Airthings hub device, such as a View series monitor or the Airthings Hub, for remote access and alerts. Airthings notes that some features are available only when it is connected.
Both the device and the app show a GOOD, FAIR or POOR indicator, and the app adds interactive graphs and what Airthings calls personalized advice on whether action is needed. The screen itself is a liquid crystal display about 1.73 inches square. Airthings markets the Corentium Home 2 for basements and ground floors, where its humidity sensor also flags damp conditions.
Independent evidence
Independent evidence
- C-NRPP 2024/25
- Not included in C-NRPP's 2024/25 evaluation
The Canadian National Radon Proficiency Program's 2024/25 comparison of consumer monitors did not include Airthings Corentium Home 2. That is a fact about which devices took part, not a finding about this one: no result from that program exists for it either way.
- Recalls
- No Health Canada recall or advisory names this device.
- Peer-reviewed studies
- We found no peer-reviewed comparison that names this model.
C-NRPP is the Canadian National Radon Proficiency Program. Its 2024/25 results were published in May 2025.
How C-NRPP says to use any consumer monitor
- Leave it in place for at least three months, ideally through the heating season, when indoor radon tends to be highest.
- Put it in a room someone uses for at least four hours a day.
- Decide about fixing your home from the long-term average, not a single day or week.
- If you can only run a monitor for less than 91 days, follow up with a long-term test.
What the manufacturer says
- Airthings states accuracy and precision within 10% after 4 days at 10 pCi/L (370 Bq/m³), and after 7 days at 5.4 pCi/L (200 Bq/m³).
- Airthings states an estimated battery life of up to 3 years unconnected, up to 2 years connected by Bluetooth and up to 3 years on SmartLink.
- Airthings describes the Corentium Home 2 as offering the same trusted accuracy as the original Corentium Home, with smart connectivity added.
These are Airthings's own statements, attributed to it. They are not our findings, and we have not tested this product ourselves.
Who it fits
Good fit if
- You want a monitor that runs on batteries, so you can place it anywhere without an outlet.
- You want long-term averages on the screen without needing a phone.
- You would like temperature and humidity in the same place you track radon.
- You already have an Airthings View monitor or Hub and want remote access through SmartLink.
Look elsewhere if
- You want a device that was itself graded in C-NRPP's 2024/25 evaluation.
- You want a reading within minutes; Airthings samples radon every 60 minutes and builds the screen around averages.
- You want remote access without buying an Airthings hub device; on its own it connects by Bluetooth only.
- You need a result for a home sale; check what your state accepts before relying on any consumer monitor.
Setup and placement
To start, Airthings says to pull the battery tab, which starts the radon measurement, then download the Airthings app and connect over Bluetooth if you want graphs. To begin a new measurement in a new location, use the Start new measurement button inside the battery compartment or the app.
Airthings' placement rules: indoors only, on the lowest floor of the home or in the living areas people use most, more than 20 inches (50 cm) above the floor, at least 3 feet (90 cm) from the nearest door, window or air vent, out of direct sunlight and moisture, and not moved during a measurement. It can lie flat or hang by a fine thread from the built-in hang lock.
Humidity matters for this one. Airthings gives a recommended operating range of 39 to 104°F with humidity below 85%, and warns that more than 85% humidity can damage the radon sensor and void the warranty, so a damp basement corner is worth checking first.
For where any radon test or monitor should sit in a home, see where to place a radon test.
What is in the box, and what it costs to run
The box holds the digital radon detector, two AA alkaline batteries already installed, a quick start guide, a regulatory information booklet and a silica bag. The detector weighs 5.08 oz (144 g) with batteries and measures 2.40 by 1.14 by 4.45 inches.
There is no lab fee and the Airthings app is free. The ongoing cost is two AA batteries, which Airthings estimates last up to 3 years unconnected and up to 2 years with Bluetooth, and notes that firmware updates may slightly change battery life. Airthings offers a free 5-year warranty if you register the device on its website within 30 days of purchase.
Compared with similar products
This product first, then its neighbors A to Z. Order is not a recommendation.
Airthings Corentium Home 2 (this page)
- Type
- Continuous monitor
- How it measures
- Alpha spectrometry, passive diffusion chamber
- Power
- Battery
- C-NRPP 2024/25
- Not included
- Type
- Continuous monitor
- How it measures
- Pulsed ionization chamber
- Power
- Plug-in
- C-NRPP 2024/25
- Approved
Plugs into the wall and connects over Wi-Fi, with a colored light rather than a number display; approved in C-NRPP's 2024/25 evaluation.
- Type
- Continuous monitor
- How it measures
- Pulsed ionization chamber
- Power
- Plug-in
- C-NRPP 2024/25
- Approved
Plugs into the wall and counts with a pulsed ionization chamber, updating every 10 minutes; approved in C-NRPP's 2024/25 evaluation with four A grades.
| Product | Type | How it measures | Power | C-NRPP 2024/25 | The difference that matters |
|---|---|---|---|---|---|
| Airthings Corentium Home 2 (this page) | Continuous monitor | Alpha spectrometry, passive diffusion chamber | Battery | Not included | The product this page covers. |
| Ecosense EcoQube | Continuous monitor | Pulsed ionization chamber | Plug-in | Approved | Plugs into the wall and connects over Wi-Fi, with a colored light rather than a number display; approved in C-NRPP's 2024/25 evaluation. |
| Ecosense RadonEye RD200 | Continuous monitor | Pulsed ionization chamber | Plug-in | Approved | Plugs into the wall and counts with a pulsed ionization chamber, updating every 10 minutes; approved in C-NRPP's 2024/25 evaluation with four A grades. |
Every continuous monitor we cover is listed on continuous monitors.
Questions people ask
Is the Corentium Home 2 C-NRPP approved?
It was not included in C-NRPP's 2024/25 consumer monitor evaluation, so there is no C-NRPP result for it either way. The evaluation approved the original Airthings Corentium Home, which Airthings now calls its previous model.
How is it different from the original Corentium Home?
Airthings lists the changes as Bluetooth connectivity and the app, temperature and humidity sensors, two AA batteries in place of three, and battery life of up to 3 years against 2 years for the previous model.
When does the screen show a reading?
Airthings says the measurement starts when you pull the battery tab, and the sensor samples radon every 60 minutes. The full set of six screen views, including the 30-day average, is available after 30 days.
Does it need Wi-Fi?
No. Airthings says it can be used as a standalone device with no wireless connection. Bluetooth connects it to the app on a phone or tablet nearby, and Wi-Fi access comes only through SmartLink to an Airthings hub device, such as a View series monitor or the Airthings Hub.
How long do the batteries last?
Airthings estimates up to 3 years on two AA batteries when it is not connected, up to 2 years with Bluetooth, and up to 3 years with SmartLink, and says firmware updates may slightly change those figures. The batteries come installed.
Can I switch it to Bq/m³?
Yes. It ships set to pCi/L and °F, and the Units button inside the back cover changes radon to Bq/m³ and temperature to °C.
What to do next
- See every continuous monitor we coverListed by type, then A to Z, each with the same fields and its evidence.Go
- Place it where it countsThe lowest lived-in level, away from drafts, at least 20 inches up.Go
- Read your resultWhat a number in pCi/L means and what the EPA says to do next.Go
- Testing for a home sale?Find radon measurement professionals in our directory.Go