Best Radon Detectors

For most homes, our best radon detector pick is Airthings Corentium Home 2: it displays averages without an app and adds optional Bluetooth history. Choose View Radon for direct Wi-Fi access, View Plus for additional air measurements, or EcoQube Flex for faster on-screen trends. First-display speed is a shopping feature; use the EPA testing procedure to decide what a result means.

Quick picks and comparison

Compare specifications and all conditions

Corentium Home 2 — most homes

Display and measurements

LCD; radon, temperature, humidity

First radon result

24-hour average after a full day

Access and export

Bluetooth; hub for remote access; synced CSV

All specifications

Power and maker-rated life

2 AA; estimates differ by document and mode, below

View Radon — direct Wi-Fi

Display and measurements

E-ink; radon, temperature, humidity

First radon result

Startup time not specified in retrieved sheet; hourly sampling

Access and export

2.4 GHz Wi-Fi; dashboard CSV

All specifications

Power and maker-rated life

6 AA or USB; feature text says up to 2 years, specs say 3

View Plus — multisensor

Display and measurements

E-ink; radon, PM2.5, CO2, VOCs, temperature, humidity, pressure

First radon result

Startup time not specified in retrieved sheet; hourly sampling

Access and export

2.4 GHz Wi-Fi; dashboard CSV

All specifications

Power and maker-rated life

6 AA or USB-C; up to 2 years

Wave Plus — Airthings add-on

Display and measurements

Glow ring; radon, CO2, VOCs, temperature, humidity, pressure

First radon result

Startup time not specified in retrieved manual; hourly radon updates

Access and export

Bluetooth; hub for remote access; dashboard CSV

All specifications

Power and maker-rated life

2 AA; 16 months Bluetooth / 18 months SmartLink

EcoQube Flex — faster trends

Display and measurements

E-ink; radon, with highs and lows

First radon result

10–15 minutes; first reliable result within an hour

Access and export

Bluetooth; no live remote access; CSV unconfirmed

All specifications

Power and maker-rated life

2 AA; up to 7 years offline / about 2 years with regular syncing

Full comparison table ↔

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Detector / pick	Display and measurements	First radon result	Access and export	Power and maker-rated life
Corentium Home 2 — most homes	LCD; radon, temperature, humidity	24-hour average after a full day	Bluetooth; hub for remote access; synced CSV	2 AA; estimates differ by document and mode, below
View Radon — direct Wi-Fi	E-ink; radon, temperature, humidity	Startup time not specified in retrieved sheet; hourly sampling	2.4 GHz Wi-Fi; dashboard CSV	6 AA or USB; feature text says up to 2 years, specs say 3
View Plus — multisensor	E-ink; radon, PM2.5, CO2, VOCs, temperature, humidity, pressure	Startup time not specified in retrieved sheet; hourly sampling	2.4 GHz Wi-Fi; dashboard CSV	6 AA or USB-C; up to 2 years
Wave Plus — Airthings add-on	Glow ring; radon, CO2, VOCs, temperature, humidity, pressure	Startup time not specified in retrieved manual; hourly radon updates	Bluetooth; hub for remote access; dashboard CSV	2 AA; 16 months Bluetooth / 18 months SmartLink
EcoQube Flex — faster trends	E-ink; radon, with highs and lows	10–15 minutes; first reliable result within an hour	Bluetooth; no live remote access; CSV unconfirmed	2 AA; up to 7 years offline / about 2 years with regular syncing

Detector / pick	Display and measurements	First radon result	Access and export	Power and maker-rated life
Corentium Home 2 — most homes	LCD; radon, temperature, humidity	24-hour average after a full day	Bluetooth; hub for remote access; synced CSV	2 AA; estimates differ by document and mode, below
View Radon — direct Wi-Fi	E-ink; radon, temperature, humidity	Startup time not specified in retrieved sheet; hourly sampling	2.4 GHz Wi-Fi; dashboard CSV	6 AA or USB; feature text says up to 2 years, specs say 3
View Plus — multisensor	E-ink; radon, PM2.5, CO2, VOCs, temperature, humidity, pressure	Startup time not specified in retrieved sheet; hourly sampling	2.4 GHz Wi-Fi; dashboard CSV	6 AA or USB-C; up to 2 years
Wave Plus — Airthings add-on	Glow ring; radon, CO2, VOCs, temperature, humidity, pressure	Startup time not specified in retrieved manual; hourly radon updates	Bluetooth; hub for remote access; dashboard CSV	2 AA; 16 months Bluetooth / 18 months SmartLink
EcoQube Flex — faster trends	E-ink; radon, with highs and lows	10–15 minutes; first reliable result within an hour	Bluetooth; no live remote access; CSV unconfirmed	2 AA; up to 7 years offline / about 2 years with regular syncing

“Not specified” concerns first-result timing, not the sampling interval. Sources: the Home 2 sheet, View Radon sheet, View Plus sheet, Wave Plus manual, Flex guide and Airthings export instructions.

Best for most homes: Airthings Corentium Home 2

The Corentium Home 2 works independently of your phone; its screen offers 24-hour, 7-day, 30-day and long-term radon averages, with the full set of views available after 30 days. The original Corentium Home is radon-only; Home 2 adds temperature, humidity and connectivity.

Check the exact version: the sheet identifies model 325, with US/Europe SKU 3250 and Canada SKU 3253, but the US store page's structured data says SKU 3255. Those identifiers disagree; confirm the supplied version before ordering rather than assuming the codes are interchangeable.

Battery estimates also conflict: the sheet gives up to 3 years unconnected, 2 on Bluetooth and 3 on SmartLink; the offline/connected help page says 3.5, 1.5 and 3 years, respectively. The stronger reason to choose it is the standalone screen plus optional saved history.

See Corentium Home 2 at Airthings

Best for radon over Wi-Fi: Airthings View Radon

View Radon, model 2989, SKU 989, combines a configurable e-ink screen with radon, temperature and humidity. Its direct 2.4 GHz Wi-Fi connection suits checking readings while away; it does not support a 5 GHz-only network.

It runs on batteries or USB, but using it as a hub for compatible Airthings monitors requires USB power. Airthings' feature text says up to 2 years on batteries; its technical specifications and sheet say up to 3 years. Read that as an unresolved estimate, not a reason to promise a particular replacement interval.

See View Radon at Airthings

Best multisensor monitor: Airthings View Plus

The View Plus, model 2960, adds PM2.5, NDIR CO2, VOCs and pressure to radon, temperature and humidity. Its e-ink display can show up to four values, and it has direct Wi-Fi.

Buy it when those extra measurements matter in the same room. Airthings describes the View models' radon technology as passive diffusion with alpha spectrometry; additional sensors are not evidence of better radon accuracy. For separate CO2 shopping, see our CO2 monitor guide.

Check price on Amazon

Best Airthings add-on with CO2: Airthings Wave Plus

The US Wave Plus page identifies model/SKU 2910 and currently marks it in stock. Its six measurements include CO2 and VOCs alongside radon, temperature, humidity and pressure; the visual indicator is a glow ring rather than a numeric screen.

Choose it for another room in an existing Airthings system. Without a hub, your phone must be nearby to sync current readings; a USB-powered View hub enables remote access. The manual says it stores readings locally for up to 80 days, so make syncing a habit. The 16-month Bluetooth / 18-month SmartLink estimates explain why its headline “1.5-year” battery claim needs context.

See Wave Plus at Airthings

Best for faster on-screen trends: Ecosense EcoQube Flex

EcoQube Flex, model EF100, uses a pulsed ionization chamber and works offline. The product page advertises a first reading in 10 minutes; the manual says 10–15 minutes, then separately specifies a first reliable result within an hour. Its “real-time” mode is a 60-minute rolling average updated every 10 minutes.

That makes it our alternative for watching shorter trends on the device. It also offers 24-hour, 72-hour, 7-day, 30-day and cumulative long-term views, plus days measured. It uses the Ecosense app, distinct from the EcoQube app; existing EcoQube app accounts can sign in with the same email and password. Bluetooth syncing does not provide live remote access. The guide documents one year on-device storage plus cloud backup; it does not establish a CSV export workflow.

See EcoQube Flex at Ecosense

Buying guide

First reading, rolling average and completed test

EPA expresses radon concentration in picocuries per liter of air, or pCi/L. The monitor codes above identify devices; the cited sheets describe sensing technology rather than supplying a separate sensor-part shopping code.

A rolling average moves forward as new data replaces older data. Flex's cumulative view instead averages the data since monitoring began. Home 2's first average arrives after 24 hours, with 7-day and 30-day views among its later windows. Flex's earlier display still represents an average, not an instantaneous reading.

EPA defines short-term tests as two to 90 days and long-term tests as more than 90 days. A longer test is more likely to represent the year-round average. Keep these distinct from a maker's startup or precision specification:

1. 1

   First display

   Home 2: 24 hours. Flex: 10–15 minutes, with a first reliable result specified within an hour.

2. 2

   Rolling window

   Home 2 adds 7-day and 30-day views; Flex's real-time mode averages 60 minutes.

3. 3

   Completed test

   EPA: short-term tests last two to 90 days; long-term tests last more than 90 days. Follow device instructions.

Accuracy and calibration: compare the conditions

Home 2's sheet specifies precision within 10% after 4 days at 10 pCi/L or 7 days at 5.4 pCi/L. The View sheets state typical 7-day-average accuracy of ±10% at 5.4 pCi/L after 30 days of continuous measuring, and ±5% for a two-month average. Airthings' general sensor explanation also qualifies its figures by that settling period, whereas the Wave Plus product page omits the qualification.

Flex specifies ±10% at 10 pCi/L after 10 hours, at 95% confidence. These differently stated figures do not establish an accuracy winner.

Airthings calls its radon process acclimatization rather than traditional calibration. Separately, View Plus and Wave Plus CO2/VOC sensors need about 7 days initially. That is a different process from collecting a radon baseline; it does not replace EPA's follow-up procedure.

Placement and keeping a useful record

EPA says to test the lowest lived-in level, in a regularly used room rather than a kitchen or bathroom, at least 20 inches above the floor, away from drafts, high heat, high humidity and exterior walls. Home 2's sheet specifies more than 20 inches above the floor and at least 3 feet from doors, windows or vents; use its stricter placement instruction. For humidity-only shopping, see our hygrometer guide.

• Yes: Choose the lowest regularly occupied level and a stable, undisturbed position.
• Yes: Keep Home 2 more than 20 inches above the floor and at least 3 feet from doors, windows and vents.
• No: Avoid kitchens, bathrooms, drafts, heat and high humidity for the EPA testing placement.

Sync before moving rooms or changing batteries. Home 2's offline history becomes inaccessible after a new measurement or battery removal; its new-location instructions say to sync fully first. Flex likewise uses separate monitoring sessions to preserve each room's synced history. An Airthings CSV uses UTC timestamps and covers up to one year per export, with adjoining exports for longer periods.

EPA procedure and next actions

Follow the Citizen's Guide, alongside the device instructions. For a 2- or 3-day short-term test, EPA says to close windows and outside doors at least 12 hours before starting and keep them closed as much as possible during the test. It also says to avoid unusually severe storms or high winds for those short tests.

• Initial short-term result at or above 4 pCi/L: take a follow-up long-term or second short-term test. If the first result is more than twice that action level, EPA says to take the second short-term test immediately.
• Long-term result at or above 4 pCi/L: EPA says to fix the home. After a second short-term test, consider fixing if the average of both tests is 4 pCi/L or higher.
• Between 2 and 4 pCi/L: EPA says to consider fixing. Use the agency's current guidance, rather than treating an app color as a completed testing procedure.

Variants that can mislead a purchase

Wave Radon is not Wave Plus or View Radon. Its US page says it is no longer available on airthings.com, though selected retailers still carry it; Airthings directs shoppers to View Radon. View hub specifications exclude first-generation Wave Radon units with serials beginning 2900, so check an older unit before planning a hub system.

EcoQube Flex is not EcoQube. The maker's comparison lists Flex as battery-powered Bluetooth with a screen, and EcoQube as a plug-in Wi-Fi model with an LED indicator and remote access. Match the full name to the connection you need.

How we choose

Specs, availability and support wording checked November 2, 2026. We compared official maker pages, sheets and instructions, with EPA guidance for test interpretation. These are research-based recommendations; thisHUSH has not conducted physical product testing. Awards prioritize readable averages, access from away, power and retained history; they do not rank sensitivity slogans or unmatched accuracy figures. Wave Radon is explained for existing owners and older listings rather than recommended as a new purchase. See how we choose.

Verdict

Start with Corentium Home 2 for a screen and optional history, after checking its version identifiers. Choose View Radon for direct Wi-Fi, View Plus for additional measurements in that room, Wave Plus to extend an Airthings hub system, or EcoQube Flex for shorter on-screen trends. Buy the data access you will use, then follow the stated measurement procedure.