Airthings Corentium Home vs Ecosense RadonEye: which is better for you?

Airthings describes the Corentium Home's radon sampling as a passive diffusion chamber and its detection method as alpha spectrometry. Air drifts into the chamber on its own, with no fan or pump, and the sensor counts the alpha particles that radon and its decay products give off. Nothing goes to a laboratory: Airthings points out that there are no lab fees and that you can check your readings whenever you need to.

Ecosense names a pulsed ionization chamber as the RadonEye RD200's sensor and rates its sensitivity at 30 counts per hour for each pCi/L of radon, which it describes as 15 times the minimum of 2 counts per hour per pCi/L that it attributes to ANSI/AARST. Ecosense ties that sensitivity to speed: it says the sensitivity lets users act quickly and that a reliable average result is produced within an hour. A 2024 field study lists the same detection principle for the RadonEye and notes that the monitors it ran work without a pump, so air reaches the chamber on its own here too.

Pulsed ionization chamber

A chamber in which the alpha particles from radon decay ionize the air, and the monitor counts each burst as a pulse. Ecosense rates the RadonEye's chamber at 30 counts per hour for each pCi/L of radon.

The Corentium Home's screen is the whole interface. Airthings describes it as a simple, always-on radon detector with short-term and long-term radon levels on an integrated LCD display, and it has no Bluetooth, Wi-Fi or app. C-NRPP's list gives its reading periods as 12 hours, 24 hours and 7 days, with the first reading taking 24 hours. Airthings adds that you can generate a radon self-inspection report to document or share your readings.

The RadonEye RD200 answers sooner. Ecosense says the first reading arrives in 10 minutes, with no 24-hour wait, and that results update every 10 minutes on the OLED display, which shows the last measurement taken and scrolls through averages. Its app connects over Bluetooth, tracks short-term and long-term trends and keeps track of hourly levels, and the device saves data for up to a year. It has no internal clock, so anything tied to a date lives in the app rather than on the screen.

The Corentium Home runs on three AAA alkaline batteries, which Airthings rates for 2 years, so it can sit in any room without a cable. The RadonEye RD200 runs from its 12 V adapter, which Ecosense sells separately as a replacement, so it needs an outlet in the room you want to measure. Ecosense says the RadonEye keeps its stored data through a power cut unless you reset it through the app, but the real-time data and the daily and weekly averages on its screen reset, and nothing is measured without power.

Neither needs a laboratory. Airthings describes a 5-year extended warranty on its consumer monitors, with registration required within 30 days of purchase. Ecosense gives the RadonEye RD200 a 12-month limited warranty, adds a one-year extension when you register the device within 30 days, and gives it an expected service life of 5 years.

Both models were approved in C-NRPP's 2024/25 consumer monitor evaluation, which put each device through four rounds of testing in four different sets of conditions, and both graded A in all four rounds. C-NRPP's list describes the RadonEye RD200 as taking measurements every 10 minutes and displaying an hourly rolling average, and the Corentium Home as showing a short-term and a long-term average on its display. C-NRPP tested Canadian-market units; we have not confirmed that the US versions are identical.

Only the RadonEye took part in a 2024 field study that ran consumer monitors beside a calibrated reference instrument at a natural radiation laboratory in Salamanca, Spain, between 1 July and 23 August 2023. Over those 54 days its average differed from the reference by -15.8%, and 2.2% of its records were lost. The Corentium Home was not among the monitors in that study, so there is no field result for it either way.

C-NRPP grade

C-NRPP grades each round by how far a monitor's reading was from the chamber's known radon level: A for an error of 10% or less, B for more than 10% and up to 20%, and so on down to E. Accuracy results explained sets out every monitor's grades.

On the independent evidence the two are level: C-NRPP approved both with an A in every round. So the pick turns on how you will use it. Each row below follows from what Airthings, Ecosense and C-NRPP state, and each monitor gets three.

Each has its own page with every specification and its evidence box: Airthings Corentium Home and Ecosense RadonEye RD200. Each is also set beside its own sibling, on Corentium Home vs Corentium Home 2 and RadonEye RD200 vs EcoQube, and every monitor we cover is on best radon monitors.

1. 1Step 1 of 6:

   Pick the floor

   The lowest lived-in level of the home, in a room used regularly, such as a living room, playroom, den or bedroom, not a kitchen or bathroom.

2. 2Step 2 of 6:

   Pick a room people use

   A room occupied for at least 4 hours each day.

3. 3Step 3 of 6:

   Set the height

   At least 20 inches above the floor, away from drafts, high heat, high humidity and exterior walls.

4. 4Step 4 of 6:

   Mind the router and the wall (RadonEye)

   Ecosense asks for at least 20 inches above the floor and from the wall, at least 24 inches from any Wi-Fi router or hotspot, and no spot close to open windows or vents.

5. 5Step 5 of 6:

   Mind the damp (Corentium Home)

   Airthings gives an operating range of 39 to 104°F with relative humidity below 85%, so a very damp corner is not the place for it.

6. 6Step 6 of 6:

   Give it time

   At least 3 months, preferably in the heating season, and decide on the long-term average. With less than 91 days of data, follow up with a long-term test.

More on placement is at where to place a radon test, and on reading the result at continuous radon monitors.