What it is and how it works
The sensor, the sampling and the readings
Airthings lists the sampling method as a passive radon diffusion chamber and the detection method as alpha spectrometry, using 4 silicon photodiodes in 4 distinct radon chambers. Airthings says the four chambers work in parallel. Air reaches them by diffusion, with no pump, and Airthings gives a diffusion time constant of 25 minutes, a measure of how quickly air inside the chambers follows the air in the room.
Its measurement range runs from 0 to 2,700 pCi/L (0 to 100,000 Bq/m³), far wider than a household monitor needs. Airthings states the measurement uncertainty as about 7% plus or minus 0.15 pCi/L after 24 hours, and about 5% plus or minus 0.06 pCi/L after 7 days. Alongside radon it logs temperature, humidity and barometric pressure, and it records motion events during a test, which a tester can include in a report.
The monitor has no screen and no on/off button. Status lights show what it is doing: green every 5 seconds while it records, green every second during a scheduled delay, yellow for a warning such as a clock that needs syncing, and red for an error. Everything else happens in software. Airthings describes two parts: the Corentium Pro mobile app, used to start and finish tests over Bluetooth, and the online Pro Dashboard, which Airthings calls the central hub for a radon testing company's operations.
That software is what makes it a professional tool. A company adds its monitors and staff to the dashboard, with managers and employees given different rights, keeps its certifications and licenses on file, and builds report templates. After a test, the technician finalizes the data set in the app, can add photos and notes on deviations from protocol or temporary conditions, and uploads it so a report can be generated in the field or by a specialist elsewhere. The app keeps cached data from monitors out of range, but Airthings notes this does not allow live, remote access to the monitor.
Memory is large: Airthings says the internal memory stores 5 years of hourly data points, about 1,900 days of measurements. It runs on 3 AA alkaline batteries, which Airthings rates at about 15 months, and has a tripod mount, a mini-USB connection and a slot for a Kensington cable lock, which the manual suggests for keeping the monitor from being moved or taken during a test.
Independent evidence
Who checks a device like this
C-NRPP's 2024/25 evaluation compared consumer monitors, not professional devices, so it has no result for Airthings Corentium Pro. A professional device is checked by calibration instead: the maker's certification and calibration statements are under “What the manufacturer says”, and a tester can show you the device's current calibration certificate.
What the manufacturer says
Airthings's own statements, attributed
- Airthings saysAirthings describes the Corentium Pro as a fully AARST-NRPP and NRSB certified product for radon professionals.
- Airthings saysAirthings states that the four radon chambers work in parallel for performance, reliability and speed.
- Airthings saysAirthings states that the monitor is tested, quality assured and calibrated by the manufacturer, and that the calibration certificate is valid for one year.
- Airthings saysAirthings states a measurement uncertainty of about 5% plus or minus 0.06 pCi/L after 7 days.
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, and look elsewhere if
Good fit if
- You test homes for clients and need a monitor with a calibration certificate and report software.
- You run a testing company and want to manage several monitors and staff from one dashboard.
- You need motion, temperature, humidity and pressure logged with each radon test.
- You want a wide measurement range for unusually high readings.
Look elsewhere if
- You want to keep an eye on radon in your own home; a consumer monitor with a screen is built for that.
- You want to see readings from away from the monitor; Airthings says there is no live, remote access.
- You do not want to plan for yearly calibration, which most jurisdictions require for professional use.
- You need a result for a home sale but are not a certified tester; hire a radon measurement professional.
Setup and placement
4 steps
- Airthings' manual is clear that it is not a placement guide: the Corentium Pro, like all radon testing devices, must be placed and used in line with the radon testing protocols required where the test takes place. For short-term tests, Airthings recommends a minimum 48-hour measurement and a 4-hour delay, with tests ending in 24-hour increments to account for day-to-night changes in indoor radon.
- To start, a Torx 6 screwdriver opens the battery compartment; after the batteries go in, the monitor self-tests for about 45 seconds and starts recording. Each user needs an Airthings account to use the app and dashboard. The monitor is made for indoor use only and must sit horizontally, never on its side. Airthings warns against more than 85% relative humidity, extended direct sunlight, shocks and vibration, and gives an operating range of 39 to 104°F.
- Between jobs, Airthings says to store it in its protective case with batteries installed, not in a vehicle, and never to let the batteries run down in the monitor. If condensation forms after moving between warm and cold places, it says to remove the batteries and leave the monitor somewhere dry for 2 hours.
- For a homeowner, the point is what to ask a tester: which device they use, when it was last calibrated, and which protocol they follow. The EPA's guidance is to fix a home at 4 pCi/L or more and to consider fixing between 2 and 4 pCi/L.
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
Contents, warranty and running costs
In the box
Airthings' manual refers to a protective case for storing the monitor, a calibration label on the device and a calibration certificate. It measures 5.5 by 5.5 by 1.2 inches and weighs 10.6 ounces with batteries. Airthings' US store also offers a 1-year extended warranty for it, and lists calibration services and monthly and weekly rental packs for professionals.
Running costs
The recurring cost for a professional is calibration: Airthings says the certificate is valid for one year and that most jurisdictions require annual calibration for professional use, and its store lists calibration services. Beyond that, the monitor takes 3 AA alkaline batteries, which Airthings rates at about 15 months and says must be alkaline (LR06).
Questions people ask
6 questions, answered
Who is the Corentium Pro for?
Radon professionals and home inspectors. Airthings sells it as AARST-NRPP and NRSB certified, with a calibration certificate valid for a year, and its software is built around companies, technicians and client reports. A homeowner watching their own radon level is the audience for Airthings' household monitors instead.
Does the Corentium Pro need calibration?
Yes, for professional use. Airthings says the calibration certificate is valid for one year and that most jurisdictions require annual calibration for professional use. The app shows the monitor's calibration expiration date.
How long should a Corentium Pro test run?
Airthings recommends at least 48 hours with a 4-hour delay for short-term tests, ending in 24-hour increments, and says every test must follow the protocol required where it takes place.
Does the Corentium Pro have a screen?
No. It has status lights and no on/off button; readings, data sets and reports are in the Corentium Pro app and the online Pro Dashboard.
Can I use a Corentium Pro for my own home sale?
Owning the device does not make you a certified tester. Airthings says every test must follow the radon testing protocols required where it takes place, so check what your state and the contract accept before relying on a result you take yourself.
How long do the batteries last?
Airthings rates 3 AA alkaline batteries at about 15 months, and says to use only alkaline AA (LR06) cells and never let them run down in the monitor.
What to do next
- See how professional monitors differCalibration, test protocols and reports, and the devices testers use.Go
- Hire a testerFind radon measurement professionals in our directory.Go
- Monitor your own homeConsumer monitors, each with its independent evidence.Go
- Read your resultWhat a number in pCi/L means and what the EPA says to do next.Go