Products

Ecosense RadonEye RD200: plug-in continuous radon monitor

Name: Ecosense RadonEye RD200
Brand: Ecosense

By Radon411 Editorial TeamUpdated October 1, 20263 min readHow we research

Short answer

The RadonEye RD200 is a plug-in radon monitor from Ecosense that counts radon with a pulsed ionization chamber, shows a new number every 10 minutes and keeps its history on your phone over Bluetooth. C-NRPP approved it in its 2024/25 consumer monitor evaluation, with an A grade in all four test rounds.

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At a glance

Type: Continuous monitor, plug-in, pulsed ionization chamber
How it measures: Pulsed ionization chamber
First reading: Within 10 minutes
Reading updates: Every 10 minutes; shows a 60-minute moving average
Display and app: Built-in display, phone app, Bluetooth
Power: Plug-in: 12V, 1A DC adapter
Units: pCi/L and Bq/m³ published
Price: Not shown. We print a price only from Amazon's live product data, with the time it was checked, and that feed is not connected yet.

Drawing of a plug-in radon monitor with a display, a cable and a wall plug — Our drawing of this type of device, not a photo of the Ecosense RadonEye RD200.

Ecosense product page

What it is and how it works

Inside the RadonEye is a pulsed ionization chamber. Ecosense's specification sheet names it as the radon sensor, and the 2024 comparison in the journal Sensors lists the same detection principle, a pulsed ion chamber, for the RadonEye and for the AlphaGUARD professional monitor it used as the reference. Air reaches the chamber on its own: the study notes that every monitor it tested works without a pump, so the air intake into the detection chamber is passive.

What sets the RadonEye apart on paper is how many counts it collects. Ecosense rates it at 30 counts per hour for each pCi/L of radon, and compares that with a 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 it promises a first reading in 10 minutes with no 24-hour wait.

The device takes a measurement every 10 minutes, and the number it reports is a 60-minute moving average, so each number reflects roughly the last hour. The small OLED screen shows the latest result and scrolls through longer averages, and the Ecosense app collects hourly readings over Bluetooth and saves data for up to a year. There is no internal clock, so anything tied to a date, such as a weekly log, lives in the app rather than on the screen.

Ecosense publishes a measurement range of 0.2 to 99.9 pCi/L, which it also gives as 7 to 3,700 Bq/m³, and an operating range of 32 to 104°F with relative humidity under 80%. The monitor has an integrated audio alarm, and its specifications list a 12V, 1A power supply.

Independent evidence

C-NRPP 2024/25

Approved in C-NRPP's 2024/25 consumer monitor evaluation

Listed by C-NRPP as "Ecosense RadonEye RD200" and "Ecosense RadonEye". Results published May 2025.

Grade by round

Round 1A218 Bq/m³, 23°C, 28% RH, 7 days
Round 2A210 Bq/m³, 29°C, 70% RH, 7 days
Round 3A436 Bq/m³, 23°C, 36% RH, 7 days
Round 4A1,201 Bq/m³, 23°C, 35% RH, 7 days

C-NRPP grades each round by measurement error: A is 10% or less, B more than 10% and up to 20%, C more than 20% and up to 30%. It recommends devices that average B or better.

Earlier round

C-NRPP's 2023 report listed “Ecosense RadonEye RD200” as having passed its performance test.

Recalls

No Health Canada recall or advisory names this device.

Peer-reviewed studies

In a 54-day field comparison at Spain's Laboratory of Natural Radiation (1 July to 23 August 2023), against a calibrated AlphaGUARD reference monitor, the RadonEye's average for the whole period was 15.8 percent below the reference's, and 2.2 percent of its expected readings were not recorded.

Notes

C-NRPP tested Canadian-market units; we have not confirmed the US version is identical.

C-NRPP is the Canadian National Radon Proficiency Program. Its 2024/25 results were published in May 2025.

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.

What the manufacturer says

Ecosense states a radon accuracy and precision of under ±10% at 10 pCi/L after 10 hours.
C-NRPP lists Ecosense's stated accuracy for the RadonEye as ±10% at 370 Bq/m³ after 10 hours of measurement.
Ecosense states that the first reading arrives in 10 minutes and that results update every 10 minutes on the OLED display.
Ecosense describes its counting sensitivity of 30 counts per hour per pCi/L as 15 times the minimum standard of 2 cph/pCi/L set by ANSI/AARST.
Ecosense states coverage of up to 1,000 square feet and an expected service life of 5 years, depending on use.

These are Ecosense'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

You want a number within minutes and want to watch how radon moves through the day, for example after sealing a crack or turning on a fan.
You have a wall outlet where the monitor can stay plugged in for months, which is how C-NRPP says to use any consumer monitor.
You want a device that took part in C-NRPP's 2024/25 evaluation and graded A in every round.
You are happy to read history in a phone app over Bluetooth rather than on the device.

Look elsewhere if

You need a test result for a home sale; check what your state accepts before relying on any consumer monitor.
You want to move the monitor from room to room on batteries: it runs only on its power adapter.
You want to check readings remotely: the RadonEye connects to your phone by Bluetooth, and Ecosense lists no Wi-Fi connection for it.
You want dated weekly or monthly views on the device itself; without an internal clock, those live in the app.

Setup and placement

Setup is short: plug in the adapter, install the Ecosense app and pair over Bluetooth. Ecosense asks that the monitor sit at least 20 inches (50 cm) above the floor and away from the wall, away from open windows, vents, high heat and high humidity, and at least 24 inches (61 cm) from Wi-Fi routers and hotspots that could interfere with it.

The EPA's own guidance for any home test points the same way: test on the lowest lived-in level, in a room that is used regularly but not the kitchen or bathroom, at least 20 inches above the floor, and away from drafts, high heat, high humidity and exterior walls.

The RadonEye keeps its stored data through a power cut, but nothing is measured while it is unplugged and the on-screen averages start again. Ecosense notes the RD200 has no reset button; you reset the data from the app's settings when you move it to a new room.

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

The box holds the RadonEye, a user guide and a power adapter, with customer support by email and a 12-month limited warranty. Registering the device within 30 days adds a one-year extension, for two years of coverage in total.

There is no lab fee and no subscription: the app is free and the monitor needs only its 12V adapter, which Ecosense sells separately if it is lost. The running cost is the electricity for a small plug-in device. Ecosense gives an expected service life of 5 years, depending on conditions and wear, after which a replacement would be the next cost to plan for.

Compared with similar products

This product first, then its neighbors A to Z. Order is not a recommendation.

Ecosense RadonEye RD200 (this page)
Type
Continuous monitor
How it measures
Pulsed ionization chamber
Power
Plug-in
C-NRPP 2024/25
Approved
Airthings Corentium Home 2
Type
Continuous monitor
How it measures
Alpha spectrometry, passive diffusion chamber
Power
Battery
C-NRPP 2024/25
Not included
Runs on two AA batteries and measures by alpha spectrometry, sampling every 60 minutes; it was not part of C-NRPP's 2024/25 evaluation.
Ecosense EcoQube
Type
Continuous monitor
How it measures
Pulsed ionization chamber
Power
Plug-in
C-NRPP 2024/25
Approved
Same maker and the same stated accuracy at 370 Bq/m³; the EcoQube connects over Wi-Fi for remote viewing and shows a colored light instead of a number display.

Ecosense RadonEye RD200 beside neighbouring products of the same type
Product	Type	How it measures	Power	C-NRPP 2024/25	The difference that matters
Ecosense RadonEye RD200 (this page)	Continuous monitor	Pulsed ionization chamber	Plug-in	Approved	The product this page covers.
Airthings Corentium Home 2	Continuous monitor	Alpha spectrometry, passive diffusion chamber	Battery	Not included	Runs on two AA batteries and measures by alpha spectrometry, sampling every 60 minutes; it was not part of C-NRPP's 2024/25 evaluation.
Ecosense EcoQube	Continuous monitor	Pulsed ionization chamber	Plug-in	Approved	Same maker and the same stated accuracy at 370 Bq/m³; the EcoQube connects over Wi-Fi for remote viewing and shows a colored light instead of a number display.

Every continuous monitor we cover is listed on continuous monitors.

Questions people ask

How quickly does the RadonEye RD200 give a reading?

Ecosense says the first result appears after 10 minutes and that a reliable average follows within an hour, because the number it shows is a 60-minute moving average updated every 10 minutes. A first reading is not a basis for any decision: C-NRPP advises running a monitor for at least three months and deciding from the long-term average.

Was the RadonEye independently tested?

Yes. C-NRPP's 2024/25 evaluation of consumer monitors approved the Ecosense RadonEye, and its detailed results show an A in each of four seven-day chamber rounds. C-NRPP tested Canadian-market units, and we have not confirmed the US version is identical.

In a separate 54-day field comparison in Spain in 2023, published in Sensors in 2024, the RadonEye's average was 15.8 percent below that of a calibrated reference monitor.

Does the RadonEye show pCi/L or Bq/m³?

Ecosense publishes its measurement range in both units: 0.2 to 99.9 pCi/L, or 7 to 3,700 Bq/m³. US guidance, including the EPA's action level, is written in pCi/L.

Can I use a RadonEye for a home sale?

Check your state's rules before relying on any consumer monitor for a sale. C-NRPP notes that the consumer monitors it lists cannot be professionally calibrated and are not approved by C-NRPP for use by radon measurement professionals.

What happens in a power cut?

Ecosense says the RadonEye keeps its stored data through a power-off unless you reset it in the app, but the live readings and the daily and weekly averages on the display reset, and nothing is measured while it has no power.