Detectors

Compare Airthings radon detectors for your home

If you have never tested, start with a free or low-cost kit from your health department. Find one near you. A detector is the step up, because it keeps measuring for as long as you leave it on. These 4 Airthings models list from $149.99 to $329.99, and Airthings says the first reading takes about 24 hours.

A kit covers a few days. A detector keeps measuring.

Illustration only. Not a real measurement.

A kit reports the average for its test days. EPA: "Because radon levels tend to vary from day to day and season to season, a short-term test is less likely than a long-term test to tell you your year-round average radon level."^{, note 1} EPA also notes that heating and air conditioning changes, and the weather, can affect readings.^{, note 2} A detector keeps measuring, so you still have readings for the weeks between tests.

EPA, A Citizen's Guide to Radon (PDF), page 5
EPA, Home Buyer's and Seller's Guide to Radon (PDF)

Lifetime lung cancer risk from radon, per 1,000 people (EPA)

Group	Of 1,000 people exposed over a lifetime, about this many could get lung cancer
20 pCi/L
People who never smoked	about 36
People who smoke	about 260
10 pCi/L
People who never smoked	about 18
People who smoke	about 150
8 pCi/L
People who never smoked	about 15
People who smoke	about 120
4 pCi/L
People who never smoked	about 7
People who smoke	about 62
2 pCi/L
People who never smoked	about 4
People who smoke	about 32
1.3 pCi/L
People who never smoked	about 2
People who smoke	about 20

EPA says to fix your home at 4 pCi/L or higher.

At 4 pCi/L, EPA compares the risk to that of dying in a car crash (people who never smoked).

A test shows your home's level on this chart for the days it ran. A detector shows the level for as long as it keeps measuring.

Source: EPA, A Citizen's Guide to Radon (2016), page 12 (PDF), checked October 4, 2026.

Which one fits

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Your case	What fits	Measures	Link	Details
Test once, this season	A test kit from your county	Radon, test period only	Find a test kit near you
No phone, radon on the screen	Corentium Home $149.99 Price checked October 1, 2026	Radon	Check price at Airthings, Corentium Home	Details Best for: Lowest price. Read radon on the screen, no phone needed. Sensors Radon only Screen Screen shows the last day, the last 7 days, and the long-term average Bluetooth, Wi-Fi, remote viewing None. No app and no viewing away from home. Power 3 AAA batteries, up to 2 years Limits Changing the batteries or pressing Reset erases stored readings.
Watch radon over time	Corentium Home 2 The one we'd buy for most homes. $179.99 Price checked October 1, 2026	Radon, temperature, and humidity	Check price at Airthings, Corentium Home 2	Details Best for: Readings on the screen, history in the app, no Wi-Fi setup. Sensors Radon, temperature, humidity Screen Screen shows 24-hour, 7-day, 30-day, and long-term radon averages Bluetooth, Wi-Fi, remote viewing Bluetooth to the free app. Viewing away from home needs an Airthings Hub or a View detector. Power 2 AA batteries, up to 3 years. Less when connected by Bluetooth. Limits Starting a new measurement without the app erases past readings.
Check readings over Wi-Fi	View Radon $219.99 Price checked October 1, 2026	Radon, humidity, and temperature	Check price at Airthings, View Radon	Details Best for: Checking readings from anywhere over Wi-Fi. Sensors Radon, humidity, temperature Screen 2.9-inch eInk screen you can set to the readings you want Bluetooth, Wi-Fi, remote viewing 2.4 GHz Wi-Fi (not 5 GHz). Viewing away from home is built in. Power 6 AA batteries or a USB cable. Airthings' battery estimates range from 8 months to 3 years. Limits Set up through the phone app.
Radon and the other View Plus readings	View Plus $329.99 Price checked October 1, 2026	Radon, PM2.5, carbon dioxide, VOCs, humidity, temperature, and air pressure	Check price at Airthings, View Plus	Details Best for: Radon plus a wider picture of your indoor air. Sensors Radon, PM2.5, carbon dioxide, VOCs, humidity, temperature, air pressure Screen 2.9-inch eInk screen showing up to 4 readings Bluetooth, Wi-Fi, remote viewing 2.4 GHz Wi-Fi. Viewing away from home is built in. Power 6 AA batteries (up to 2 years) or USB-C Limits Needs the phone app to set up and run.
Smoke, dust, pollen	Renew	HEPA 13 and activated charcoal filters (Airthings)	See the Renew at Airthings

Prices are from the Airthings store on October 1, 2026 and can change.

Why we'd buy the Corentium Home 2

It measures radon, temperature, and humidity.
It shows radon averages on its own screen, so you don't need a phone.
The Bluetooth app keeps your history, with no Wi-Fi setup.
It runs on 2 AA batteries.
It costs less than the Wi-Fi models.

If you only need one result for this season, a kit does that job for less.

Why a detector helps

Radon professionals use continuous detectors to troubleshoot homes that are hard to get under control, and to watch the radon level while a system is adjusted. The official result still comes from professional testing.

At home, you can see the level between lab tests and follow it over time. When you are done, start a new measurement, or hand the detector to someone else.

Questions about radon detectors

Should I choose a test kit or a reusable detector?

If you have never tested, start with a kit. Many health departments sell them at low cost. Find one near you.
If you want to follow your readings over time, a detector keeps measuring.
Neither one lowers radon. EPA says to fix a home at 4 pCi/L or higher.

Which models work without Wi-Fi?

The Corentium Home and Corentium Home 2 work without Wi-Fi. Both show radon on their own screen. The Corentium Home 2 also connects to the app by Bluetooth. The View models use 2.4 GHz Wi-Fi.

Can I see readings while I'm away?

With the View Radon or View Plus, yes. They connect over Wi-Fi and need no extra equipment.
With the Corentium Home 2, only if you add an Airthings Hub or a View detector, sold separately.
With the Corentium Home, no.

How long should I measure before I trust the number?

Airthings says the first reading takes about 24 hours. It recommends at least 7 days for a decent measurement and 30 days for a more accurate one. Go by the long-term average, not one high day. EPA says a long-term test (more than 90 days) gives a better picture of your year-round average.

Where should I put it?

For a radon test, EPA says to use the lowest level you live on, in a room you use often. Avoid the kitchen and bathroom.
Set it at least 20 inches above the floor, away from drafts, high heat, high humidity, and exterior walls.
Airthings says never to put it outdoors or anywhere above 85% humidity. The View models go at breathing height, 40 to 70 inches.

Can I move it between rooms or homes?

Yes. Start a new measurement in each spot. On the Corentium Home, Reset erases the stored readings. On the Corentium Home 2, sync to the app first to keep them. Airthings suggests at least 30 days in each spot for a reliable long-term average.

Does a detector replace a real estate test?

No. Airthings says it does not recommend its home detectors for professional home inspections. Use the test your state or the sale requires. Check the radon rules in your state.

Is a subscription required?

Airthings' pages for these four list no subscription. The Airthings app is free. The View Plus needs the app to set up and run. Checked October 1, 2026.

What should I do about high readings?

EPA says to fix the home at 4 pCi/L or higher, and to consider fixing between 2 and 4 pCi/L.
EPA bases that decision on a long-term test or two short-term tests. See EPA's steps for your number.
Airthings says one high day is generally nothing to be alarmed by.
Hire a qualified mitigator. Your state radon program can help you find one.