What it is and how it works
The sensor, the sampling and the readings
Ecosense lists the detection technology as a pulsed ionization chamber, with a sensitivity of 30 counts per hour per 1 pCi/L (37 Bq/m³), the same sensor and sensitivity it lists for its plug-in RadonEye RD200 and EcoQube. Air reaches the chamber through vents on the device, which Ecosense asks you not to block.
The first reading appears within 10 to 15 minutes of putting the batteries in, and Ecosense gives the first reliable result as within an hour. The reading updates every 10 minutes as a 60-minute rolling average. Ecosense states a measurement range of 0.2 to 99.9 pCi/L (7 to 3,700 Bq/m³).
What sets it apart from Ecosense's plug-in monitors is the screen and the power. The always-on E-Ink display shows the radon level with a green, orange or red guide bar, and for each of six modes (real-time, 24-hour, 72-hour, weekly, monthly and long-term, up to a year) it also shows the highest and lowest readings in that period. The MODE button steps through them, and a Days Measured view shows how long the monitor has been running.
Ecosense notes a detail worth knowing before you move it: the real-time, 24-hour, 72-hour, weekly and monthly views reset if the device loses power, while the long-term average stays unless the device is factory reset. The device stores a year of data, and the Ecosense app over Bluetooth Low Energy adds cloud backup, charts and room-by-room records.
Because it runs on batteries, Ecosense designs it to be carried from room to room: you can save readings by room, floor or property in the app and compare a room again later. It works as a standalone device with no Wi-Fi, so there is no access from away from home; the app collects the readings when your phone is nearby.
Independent evidence
C-NRPP 2024/25, recalls and studies
- C-NRPP 2024/25
- Not included in C-NRPP's 2024/25 evaluation
The Canadian National Radon Proficiency Program's 2024/25 comparison of consumer monitors did not include Ecosense EcoQube Flex. That is a fact about which devices took part, not a finding about this one: no result from that program exists for it either way.
- Recalls
- No Health Canada recall or advisory names this device.
- Peer-reviewed studies
- We found no peer-reviewed comparison that names this model.
- Notes
- Ecosense's store record shows the EcoQube Flex first published in November 2025, after C-NRPP's 2024/25 report.
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's own statements, attributed
- Ecosense saysEcosense states accuracy and precision of ±10% at 10 pCi/L (370 Bq/m³) after 10 hours, at a 95% confidence level.
- Ecosense saysEcosense states the EcoQube Flex runs up to 7 years on its batteries in offline mode, or about 2 years with regular Bluetooth connectivity and app syncing.
- Ecosense saysEcosense describes the EcoQube Flex as having 15 times greater sensitivity than U.S. industry standard requirements.
- Ecosense saysEcosense states the EcoQube Flex covers up to 1,000 square feet.
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, and look elsewhere if
Good fit if
- You want to move one monitor from room to room and compare the results.
- You want a reading within the first hour, with highs and lows shown on the screen.
- You want a battery device that needs no outlet and no Wi-Fi.
- You want an audible alarm with a threshold you can set.
Look elsewhere if
- You want a device that was itself graded in C-NRPP's 2024/25 evaluation.
- You want to check readings from away from home; it connects to its app over Bluetooth only.
- You plan to unplug or swap batteries often and want every short-term view kept; those views reset on power loss.
- You need a result for a home sale; check what your state accepts before relying on any consumer monitor.
Setup and placement
4 steps
- Insert the two AA batteries and the monitor turns itself on; wait for the screen to change from Booting to Measuring, and the first reading follows within 10 to 15 minutes. Ecosense's app for this model is the Ecosense app, not the older EcoQube app.
- Ecosense's placement advice: a lived-in area, at least 3 feet from doors and windows, at least 20 inches (50 cm) above the floor with 1 to 3 feet ideal, on a stable, flat surface, and away from heating and cooling vents, kitchens, bathrooms and direct sunlight. To compare rooms, it suggests leaving it in each spot for at least 2 to 7 days before moving it.
- The default alarm threshold is 4.0 pCi/L in the United States; holding the ALARM button for 3 seconds lets you set it anywhere from 1.0 to 27 pCi/L, and the SET button switches between pCi/L and Bq/m³. Ecosense gives an operating range of 32 to 104°F with relative humidity below 80%, and warns that high humidity can permanently alter the sensor's sensitivity.
- For a decision about fixing your home, C-NRPP's advice for any consumer monitor applies: keep it in a room occupied at least 4 hours a day for a minimum of 3 months, preferably in the heating season, and decide on the long-term average. The EPA's own 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
Ecosense lists the box contents as the EcoQube Flex, two AA batteries and a quick start guide, with an online user guide. It measures 3.14 by 3.14 by 2.95 inches and weighs 0.518 lb with batteries. Ecosense gives a one-year limited warranty, extended by a further year if you register the device within 30 days.
Running costs
There is no lab fee and the Ecosense app is free to use. The running cost is two AA batteries, whose life Ecosense puts at up to 7 years offline or about 2 years with regular app syncing. There is no subscription.
Questions people ask
6 questions, answered
How is the EcoQube Flex different from the EcoQube?
Both use Ecosense's pulsed ionization chamber. The EcoQube Flex runs on two AA batteries, has an always-on E-Ink screen with highs and lows, and connects over Bluetooth. The EcoQube plugs in, shows a colored light instead of a number, and connects over 2.4 GHz Wi-Fi for access from anywhere.
Is the EcoQube Flex C-NRPP approved?
It was not included in C-NRPP's 2024/25 evaluation, so there is no C-NRPP result for it either way. Ecosense's plug-in EcoQube and RadonEye RD200, which use the same kind of sensor, were approved in that evaluation.
How soon does it give a reading?
The first reading appears within 10 to 15 minutes, and Ecosense gives the first reliable result as within an hour. After that the reading updates every 10 minutes as a 60-minute rolling average.
Does the EcoQube Flex need Wi-Fi?
No. It works offline as a standalone device and connects to the Ecosense app over Bluetooth Low Energy for history, charts and cloud storage when your phone is nearby.
How long do the batteries last?
Ecosense says up to 7 years in offline mode, or about 2 years with regular Bluetooth connectivity and app syncing, on two AA batteries.
What happens to the readings if I take the batteries out?
Ecosense says the real-time, 24-hour, 72-hour, weekly and monthly views reset when the device loses power, and the long-term average stays unless you factory reset it. Sync with the app before starting a new session.
What to do next
- See every continuous monitor we coverEach with the same fields and its evidence.Go
- Place it where it countsThe lowest lived-in level, away from drafts, at least 20 inches up.Go
- Read your resultWhat a number in pCi/L means and what the EPA says to do next.Go
- Testing for a home sale?Find radon measurement professionals in our directory.Go