Skip to content
RADON411

TurinSen

TurinSen Hello Radon C

Battery radon monitor with an e-ink screen

  • Monitor
  • Battery
  • Screen
  • First reading in 24 hours
C-NRPP 2024/25 evaluation: Not includedSee the evidence
  • TurinSen Hello Radon C
  • TurinSen Hello Radon C, photo 2 of 4
  • TurinSen Hello Radon C, photo 3 of 4
  • TurinSen Hello Radon C, photo 4 of 4

Photos: TurinSen

Available at Amazon (opens in a new tab)Check price on Amazon (opens in a new tab)

As an Amazon Associate, Radon411 earns from qualifying purchases.

Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates.

See ratings and reviews on Amazon (opens in a new tab)
  • PowerBattery
  • ReadingsScreen
  • First reading24 hours
  • C-NRPP 2024/25Not included
  • Every figure checked against the specifications TurinSen publishes
  • Independent test results shown the same way for every product, unranked
Compare with similar items

About this item

As TurinSen states it

  • How it measures: Passive radon diffusion chamber with an alpha spectrometry sensor
  • First reading: Within 24 hours
  • Display and app: Built-in display
  • Power: Battery: 3 AAA alkaline batteries (LR03); 2 years battery life; cable free

The Hello Radon C, model RN-300C, is a cordless radon monitor from TurinSen, a radon-monitor factory in Shenzhen, China that also builds for other brands: a passive diffusion chamber with an alpha spectrometry sensor, a 1.54-inch e-ink screen, a color-coded light and bar, and three AAA batteries TurinSen rates for 2 years. It was not included in C-NRPP's 2024/25 evaluation, so there is no independent result for it either way.

What you get

TurinSen's page says the monitor runs on three AAA alkaline (LR03) batteries but does not list the package contents or a warranty, so both are not stated by the maker. TurinSen's catalogue calls it a factory specialized in designing and manufacturing radon monitors since 2015 and says OEM and ODM orders are welcome, so check the box contents, warranty and support with the seller you buy from.

In the box and running costs

How it works

What it measures and how

The sensor, the sampling and the readings, then who has checked it

How it works

In our words, from the maker's documents

TurinSen lists the detecting technology as a passive radon diffusion chamber and the sensor as an alpha spectrometry sensor. Passive means room air reaches the chamber on its own, with no fan or pump, and the reading is made inside the monitor, with nothing sent to a laboratory.

TurinSen says accurate readings are produced after 24 hours of operation. Measurement data is shown on a power-efficient e-ink screen, and the monitor gives visual notifications when the radon concentration becomes unhealthy. TurinSen's page does not give the update interval, which averages the screen shows, or how much history the monitor keeps, so those are not stated by the maker.

The radon level is also shown two other ways: a color-coded bar on the screen, and a color-coded LED that flashes once per minute so the level can be seen from across a room. TurinSen does not give the levels at which the colors change, and it lists no sound alarm, no app and no wireless connection.

TurinSen publishes a measurement range of 0 to 9999 Bq/m³, or 0 to 500 pCi/L, and an operating range of 0 to 40 °C at relative humidity below 95%. The Hello Radon C measures 100 mm (D) by 33 mm (H) and weighs 157 g with its batteries. The page gives the range in both units but does not say which unit the screen shows or whether it can be switched.

TurinSen lists two Hello Radon models. The Hello Radon C is RN-300C; the Hello Radon S is RN-300S, in a 103 by 103 by 33 mm case, with the same detecting technology, sensor, battery, screen, range and accuracy figures. Both can stand on a surface or hang on a wall.

What the manufacturer says

TurinSen's own statements, attributed

  • TurinSen saysTurinSen lists the accuracy and precision as typical at 200 Bq/m³: under 10% after 7 days and under 5% after 2 months.
  • TurinSen saysTurinSen states that the three AAA alkaline batteries (LR03) give 2 years of battery life, and calls the monitor cable free.
  • TurinSen saysTurinSen describes the e-ink screen as high contrast, with high reflectance and an ultra wide viewing angle.
  • TurinSen saysTurinSen describes the Hello Radon C as CE and FCC certified.
  • TurinSen saysTurinSen says the monitor suits checking the radon level at home, in school, in an office or any other indoor environment.
  • TurinSen saysTurinSen states that it has a radon laboratory with a radon chamber and that all of its products are unique and patented.

These are TurinSen's own statements, attributed to it. They are not our findings, and we have not tested this product ourselves.

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 TurinSen Hello Radon C. 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
  • No Health Canada recall or advisory (radon search, seven notices), no CPSC recall, and no row of C-NRPP's consumer page or 2024/25 report names TurinSen, Qeye, Hello Radon or an RN-300C (checked 2026-10-08).
  • TurinSen's 2025 catalogue lists its ECO Radon as type RN-55, and C-NRPP's 2024/25 report lists "LifeBasis RN-55" as not approved and marks it recalled by Health Canada. The Hello Radon C is a different TurinSen model, RN-300C, with an e-ink screen.
  • TurinSen's Hello Radon S is model RN-300S, the manufacture model INKBIRD's manual gives for the INK-RD3.

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

Specifications

Specifications

Every figure as the maker states it

Compare side by side

The maker's figures

Type
Continuous monitor, battery (3 AAA), e-ink screen, color LED and bar, no app
How it measures
Passive radon diffusion chamber with an alpha spectrometry sensor
First reading
Within 24 hours
Reading updates
Not stated by the manufacturer
Display and app
Built-in display
Power
Battery: 3 AAA alkaline batteries (LR03); 2 years battery life; cable free
Units
Not stated by the manufacturer

What is in the box

TurinSen's page says the monitor runs on three AAA alkaline (LR03) batteries but does not list the package contents or a warranty, so both are not stated by the maker. TurinSen's catalogue calls it a factory specialized in designing and manufacturing radon monitors since 2015 and says OEM and ODM orders are welcome, so check the box contents, warranty and support with the seller you buy from.

What it costs to run

There is no lab fee, subscription or app. The running cost is batteries: three AAA alkaline (LR03) cells, which TurinSen rates for 2 years. TurinSen does not say what happens to the readings when the batteries are changed, so that is not stated by the maker.

TurinSen publishes no calibration service, sensor lifespan or replacement schedule for the Hello Radon C, so those are not stated by the maker either. C-NRPP notes that consumer radon monitors cannot be professionally calibrated; TurinSen says it has its own radon chamber.

Fit and setup

Who it fits, and how to use it

The fit, then setup and placement as the guidance asks

Who it fits

Good fit if, and look elsewhere if

Good fit if

  • You want a cordless monitor that can stand on a shelf or hang on a wall, on three AAA batteries TurinSen rates for 2 years.
  • You want a glanceable color light and bar on the device rather than an app.
  • You want a reading on the device itself, with no phone, app or account.
  • You want a small unit: TurinSen lists 157 g with batteries and 33 mm deep.

Look elsewhere if

  • You want a monitor whose own model was graded in C-NRPP's 2024/25 evaluation; the Hello Radon C was not included.
  • You want to know how often it updates, which averages it shows or how long it keeps data; TurinSen does not publish those.
  • You want a sound alarm or phone alerts; TurinSen lists only a light and a color bar.
  • You need a result for a home sale; check what your state accepts before relying on any consumer monitor.

Setup and placement

3 steps

  1. TurinSen gives two mounting options, free standing or wall mounted, and says the monitor runs cable free on three AAA alkaline batteries. It publishes no placement rules or start-up steps for the Hello Radon C, so those are not stated by the maker, and it says accurate readings come after 24 hours of operation.
  2. The EPA's general guidance for any home radon test is to measure on the lowest lived-in level of the home, in a room 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 EPA says to fix the home at 4 pCi/L or more and to consider fixing between 2 and 4 pCi/L.
  3. C-NRPP's advice for any consumer monitor is to place it in a room occupied at least 4 hours a day, test for a minimum of 3 months, preferably in the heating season, and decide on the long-term average, following up with a long-term test if you have less than 91 days of data. TurinSen's own accuracy figure also narrows with time, from under 10% at 7 days to under 5% at 2 months.

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.

For where any radon test or monitor should sit in a home, see where to place a radon test.

Compare

Compare with similar items

The same three rows for each, and the one difference that matters

Compare side by side

More home radon monitors31

All home radon monitors

Questions

Questions people ask

6 questions about the TurinSen Hello Radon C, answered

Asked about the Hello Radon C

Who makes the Hello Radon C?

TurinSen, whose catalogue is published under the company name Shenzhen Turin Sensing Technology Co., Ltd., in Shenzhen, China. TurinSen says it was established in 2015 as a branch company under Aier Technology (Hong Kong), and its catalogue says OEM and ODM orders are welcome. Its model number for the Hello Radon C is RN-300C.

Is the Hello Radon C on C-NRPP's not-approved list?

No. It was not included in C-NRPP's 2024/25 evaluation, so there is no C-NRPP result for it either way.

C-NRPP's 2024/25 report does list a LifeBasis monitor, model RN-55, as not approved and marks it recalled by Health Canada. TurinSen's 2025 catalogue uses the type number RN-55 for its own ECO Radon, a battery model with a large LCD screen. The Hello Radon C is a different model, RN-300C, with an e-ink screen.

Does the Hello Radon C have an alarm?

Not one you can hear, by TurinSen's account. It lists a color-coded LED that flashes once per minute, a color-coded bar on the screen, and visual notifications when the radon concentration becomes unhealthy. With no sound and no app, a high reading is only noticed by someone who looks at the monitor.

How long before it gives a reading I can use?

TurinSen says accurate readings are produced after 24 hours of operation, and it does not publish how often the screen updates after that. For a decision about fixing a home, C-NRPP's advice for any consumer monitor is to run it for at least 3 months and use the long-term average.

How accurate does TurinSen say it is?

Under 10% after 7 days and under 5% after 2 months, typical, at 200 Bq/m³. TurinSen does not describe the test conditions behind the figure, and no independent program has published a result for the Hello Radon C.

How is it related to INKBIRD's INK-RD3?

INKBIRD's manual gives the INK-RD3's manufacture model as RN-300S, the model number TurinSen uses for its Hello Radon S. TurinSen lists the Hello Radon C and S with the same detecting technology, sensor, battery, screen, range and accuracy figures; the C is listed at 100 mm (D) by 33 mm (H) and the S at 103 by 103 by 33 mm.

What to do next

Updated October 9, 2026