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Airthings Corentium Home 2

Battery digital radon monitor

  • Monitor
  • Battery
  • Screen and app
  • Bluetooth
C-NRPP 2024/25 evaluation: Not includedSee the evidence

Best for, and skip if

Best for you 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.

Skip it 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.
See how it compares: Corentium Home vs Corentium Home 2Who it fits
  • Airthings Corentium Home 2
  • Airthings Corentium Home 2, photo 2 of 5
  • Airthings Corentium Home 2, photo 3 of 5
  • Airthings Corentium Home 2, photo 4 of 5
  • Airthings Corentium Home 2, photo 5 of 5

Photos: Airthings

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  • PowerBattery
  • ReadingsScreen and app
  • C-NRPP 2024/25Not included
  • Every figure checked against the specifications Airthings publishes
  • Independent test results shown the same way for every product, unranked
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About this item

As Airthings states it

  • How it measures: Alpha spectrometry, passive diffusion chamber
  • 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

The Corentium Home 2 is Airthings' battery-powered radon detector: two AA batteries, an alpha spectrometry sensor, an LCD screen with 24-hour to long-term averages, and Bluetooth to the Airthings app, plus temperature and humidity. It was not included in C-NRPP's 2024/25 evaluation, which tested the original Corentium Home.

What you get

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.

In the box and running costs

How it works

What it measures and how

The sensor, the sampling and the readings, then who has checked it

How it works

In our words, from the maker's documents

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.

What the manufacturer says

Airthings's own statements, attributed

  • Airthings saysAirthings 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 saysAirthings 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 saysAirthings 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.

Independent evidence

C-NRPP 2024/25, recalls and studies

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.

Airthings Corentium Home 2

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Specifications

Specifications

Every figure as the maker states it

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The maker's figures

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

What is in the box

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.

What it costs to run

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.

Fit and setup

Who it fits, and how to use it

The fit, then setup and placement as the guidance asks

Who it fits

Good fit if, and look elsewhere if

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

3 steps

  1. 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.
  2. 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.
  3. 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.

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.

For where any radon test or monitor should sit in a home, see where to place a radon test.

Compare

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Questions

Questions people ask

6 questions about the Airthings Corentium Home 2, answered

Asked about the Corentium Home 2

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

Updated October 1, 2026