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Airthings Corentium Home Radon Detector 223 Portable, Lightweight, Easy-to-Use, (3) AAA Battery Operated, USA Version, pCi/L


(4 customer reviews)
Last updated on May 27, 2023 8:52 am Details
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  • FIRST OF ITS KIND: The first battery-operated, digital radon detector. Monitor your home without the need for an outlet.
  • LONG TERM MONITORING: Monitor for cancer-causing radon gas. Long term monitoring is necessary as radon levels fluctuate daily.
  • BE IN CONTROL: Take action if your radon levels are high. Know if your improvements have worked by checking the short term, on-screen readings.
  • RADON REPORT: Generate a radon self-inspection report easily, whenever you need it.
  • FAST RESULTS: On-screen results show both long and short term readings, for a quick overview of your radon levels.

Specification: Airthings Corentium Home Radon Detector 223 Portable, Lightweight, Easy-to-Use, (3) AAA Battery Operated, USA Version, pCi/L

Is Discontinued By Manufacturer


Product Dimensions

4.7 x 2.7 x 1 inches, 3.52 Ounces

Item model number



3 AAA batteries required. (included)

Date First Available

December 3, 2013



Country of Origin


Photos: Airthings Corentium Home Radon Detector 223 Portable, Lightweight, Easy-to-Use, (3) AAA Battery Operated, USA Version, pCi/L

4 reviews for Airthings Corentium Home Radon Detector 223 Portable, Lightweight, Easy-to-Use, (3) AAA Battery Operated, USA Version, pCi/L

3.3 out of 5
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  1. Adam

    Opened the box and pulled the plastic tab as instructed. About a minute into the calibration phase, I received an “ERR 518”. I reset the unit and same thing, three times in a row. Replaced the batteries and this time I got an “Err 4” and “Err 6” code. Seems that others have this error after many years of use. So, I either got a DOA until or one that was returned and sold as new. Returning and buying another.

    I will update as I receive a replacement unit but spending $200 on a unit like this and receiving a DOA makes you question the quality control and potential accuracy for that matter.


    I purchased two more units. This time both work without an issue but one of the units has bubbles on the screen from the protection tape and the battery tab missing. AMAZON IS SELLING USED UNITS AS NEW. I ran both units for 3 days next to each other in the basement and got completely different readings. See second photo. With a $200 piece of equipment you’d think there would be quality control with a more accurate calibration. How is amazon returns looking past this, or why are the units not sealed to indicate they have in fact been open.

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  2. I. Kim

    I’m a science researcher in National Lab. I bought one Corentium Home Radon Detector (Airthings 223) in September 2018 and my friend bought same one in October 2018.
    We compared these devices’ result at the same time in a basement for 3 weeks in November, 2018. Both devices were closed each other: 2 cm distance as shown in the picture. The measured values were supposed to be same value within reasonable tolerance, however, the two devices showed totally different measurement results. One was 1.72 pCi/L and the other was 3.18 pCi/L for long term average.
    This means that the device’s accuracy is very poor or calibration was totally wrong. I’m so disappointed from Airthings and I DO NOT recommend this Radon detector. After contacting manufacturer, I will update their response.

    Update on 3/9/2019:
    Customer service was good. They respond immediately and replaced the item by new one. I wanted re-calibrate the item, so I can compare the value before and after calibration. However, they could do only replacement instead of re-calibration. Currently I’m testing new item and will update result soon.

    Update on 11/14/2020
    Sorry for late update. This replaced new Airthing had almost same value with the left-sided item of the uploaded picture at the same location and condition.
    Recently, radon was measured twice by the replaced new Airthings 223 and Model 1028 of Sun Nuclear co. simultaneously for each 48 hours in my basement. In first measurement, this Airthings 223 had 0.24 pCi/L and the Model 1028 got 0.5 pCi/L with frequently opening window condition. The second measurement with closing windows condition, Airthings had 0.74 pCi/L and the Model 1028 got 1.6 pCi/L. The Model 1028 is calibrated Sun Nuclear Corporation in Florida every year. Then, it looks actual value is around two fold of my new Airthings 223 value. Manufacturer’s calibration is totally wrong and they don’t serve re-calibration.

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  3. tenor1

    I am a retired chemist so I’m concerned about radon emissions. I had absolutely no knowledge of this product or company until I found out that have a lot of radon in my new home. So, I purchased a model 223 a couple weeks ago and am using it to help me understand the situation while I wait for remediation. It’s doing a wonderful job of informing me of ‘hot spots’ and the average level throughout the house while I hold my breath.

    Now to its accuracy. The Corentium 223 specification is perhaps the most honest approach to accuracy I have ever seen in a consumer product. It’s based on: ‘sigma = less than [a percentage and the length of test]. It is statistical probability specification of accuracy and it is rich in accuracy information. However, you need to do the math, understand what ‘sigma’ means in variance statistics, understand probability distribution curves, and then the use the spec to calculate the worst case accuracy of the device associated with your own radon situation). So, please do that before you criticize the device. If you studied the specification and did the math, as I have, you would see that it is quite accurate for an inexpensive radon continuous monitoring device…. and way more than suitable for home use.

    Let me repeat that again. If you use the device as instructed by the manufacturer and are willing to trust the specification as determined by some very smart people who spent a lot of time, money and brainpower to prepare it, then you will be measuring Radon and its variability in your home in a way that is vastly superior to doing periodic mail away tests.

    The radon in your home varies from day to day, month to month, hour to hour. The anecdotal ‘evidence of accuracy’ presented in virtually all of these reviews is absolutely without merit. Why, because determining the accuracy of the device against a standard source is extremely complicated. As a chemist I know that for a fact. We, as customers, do not have the time, money, equipment, or knowledge to do it – period. If you are somehow guessing that you need better accuracy in a shorter period of testing then please consider buying the Corentium pro for $1200 or perhaps some other professional device. You may not get better accuracy but you will likely get equivalent accuracy in a shorter period of time…. that’s how the statistics work. Please read the last two sentences again.

    Consider this too. The manufacturer, Air Things, is based in Europe and it appears to be a spin off of CERN in Geneva, Switzerland. Look up CERN in Wiki. You will be impressed. They are the world’s leading experts on making and measuring radiation. I am impressed because their ‘no calibration necessary’ technology for this device (and their more expensive professional models) seems to be the result of a micro miniaturized, more precise spectroscopic technology for measuring radioactive decay of radon daughters alpha particle emissions.

    Finally, I’ve read literally hundreds of these Amazon reviews where accuracy is mentioned… and actually is somehow mysteriously determined in the basement of their home. However, I’ve not seen one review that references the manufacturer’s specification. Everyone here that’s comparing ‘this to that’ or ‘that to this’ and making claims about ‘accuracy’ doesn’t have a clue what they are talking about. However, a number of thoughtful reviewers seem to have run side by side tests with other devices or mail away canisters. Assuming those tests were done properly, then they can be considered slightly helpful but otherwise of no use in determining the device’s accuracy.

    I’m going by the specification. I’m confident in my device and am very relieved that I own one.

    —- UPDATE: April 28, 2021 I bought a second unit a couple months after purchasing the first, so both are now over two years old. I am very happy with both units. No problems – I lent one out to my daughter for a few months. Now I keep one in the basement and the other on the first floor. I recently replaced the batteries in the first unit (a two year battery life – just like the manufacturer said) and have had no problems at all with either unit.

    Regarding Accuracy – I am reiterating that the Airthings accuracy specifications (which result from the highly advanced ‘spectroscopic’ technology behind it) are extraordinary for a low priced unit. Don’t believe the misinformation from reviewers here who claim to have determined the ‘accuracy’ of their Airthings unit as bad or good by running some kind of ‘test’. You/ Me / Other Reviewers / cannot in any way determine the accuracy of any type of radon device or test kit on the market – not for any device – not for any manufacturer). Period.

    The only choice you have for determining the accuracy of any device you buy is to trust the manufacturer, the manufacturer’s statistical process control, and that the manufacturer truly, deeply understands the extremely complex issues in radon measurement. The Airthings company was founded by CERN scientists. CERN is where many of the smartest on this planet create and measure radiation with the Large Hadron Collider (LHC). So… I trust the Airthings accuracy specification.

    So – If you really want to know the accuracy of any type of any radon monitoring detector you purchase (regardless of the manufacturer), here is what I would recommend so as to get decent accuracy results.
    – identify an analytical laboratory highly specialized and experienced in the many complexities of radon measurement
    – ensure that it is a laboratory using standards and equipment based on measuring radon in the atomic form(s) in which it is most carcinogenic,
    – send them your device and have it tested under tightly controlled laboratory conditions for a period of time (that is dependent on the rate at which that particular device model approaches the true radon value).

    For me, buying two of the Airthings devices was an easy decision once I researched and understood the issues in Radon measurement, and the various devices available.

    As I said previously, I have no affiliation of any kind with this company, but I do get frustrated when reviewers who have no clue what they are talking about provide horrible misinformation for the rest of us.

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  4. A250212

    Buen producto , confiable y las mediciones comparadas con otros equipos lo hacen confiable… recomendado totalmente para medición de gas radón en domicilio

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    Airthings Corentium Home Radon Detector 223 Portable, Lightweight, Easy-to-Use, (3) AAA Battery Operated, USA Version, pCi/L
    Airthings Corentium Home Radon Detector 223 Portable, Lightweight, Easy-to-Use, (3) AAA Battery Operated, USA Version, pCi/L
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