Ecosense RD200 RadonEye, Home Digital Radon Detector: Fast and Accurate Detection of Fluctuating Radon Levels, Short and Long Term Continuous Monitoring with Trend Charts

This unit (RadonEye RD200) is very easy to setup, and gives you accurate results fast! Your first reading in 10 minutes and a very accurate reading after your first hour and every hour! It actually measures 30 times an hour and gives you detailed charts of all your readings in the app for your phone, and also displays the highest detected Radon level. I love that it shows the level of Radon on the unit itself too so if you are near it and just want to see what it says, it’s right there…no need for your phone or internet access, etc. You can see even more details on the app via Bluetooth so you can see your results on your phone without having to be right at the unit as well. Another huge benefit is that you can set it to alarm at any level, or not at all… (default is 4). I prefer to have it alert me if radon goes over 3. Most importantly it works accurately and fast! Other brands typical take 48 hours before your first reading and then don’t give you detailed results, but instead only give an average sample. They will still help, but this is much more detailed, fast and accurate all in one! The only thing I wish it had (with the detailed graph chart) was times of all the readings. It shows you all the levels, and the peak level and average level, but not what time they occurred. Other than that, I highly recommend this product!

Live in a high radon area and failed old style charcoal canister test. Hoped I solved problem by finishing basement and installing vinyl sheeting behind the walls to stop air intrusion. Never retested until I read about about this radon detector in Times magazine review of top 100 new products of 2021. Readings in unfinished furnace area were consistent with earlier charcoal canister test. Reading in finished basement were cut in half but still over threshold for action. Will follow up with radon mediation contractors for estimates. What a GREAT product and I believe worth the much greater initial cost compared to mail in canister tests. You can easily make multiple tests over multiple days to see how readings fluctuate over time and quickly get results. It would cost more and take months to do this with the mail order tests. I have recorded the results from two day tests at different locations in my basement using the Ecosense app. This requires some renaming and storing of files using the app that maybe too complicated for some users since there are no step by step instructions provided. A simple alternative is to just record “screen shots” of the graphs and store them in your photos instead of on the app. I plan to redo the tests after remediation and use the before and after results to share with contractor as needed. I am also now doing similar tests throughout the first and second floors just to see if heating or air conditioning disperses radon gas throughout the house. This is the most extensive review I have ever written on Amazon. Since it really does impact your health and for anyone (like myself) who reads these reviews to try and make an informed decision, I want to pass along several other factors that impacted my positive review both before and after the purchase. I purchased this product instead of the slightly cheaper new model (EQ100 Cube) that was reviewed in the Times magazine article after reading Amazon reviews for that product. I liked the idea of not having the RD200 connected to the internet and not having results stored on-line with address information as in the EQ100. Some reviews of the RD200 from 2017 mentioned the need to provide average and peak values for the measurement interval, I was pleased to see that the manufacturer now provides this for the measurement interval. In addition, I was also concerned that I would only be able to store 1 years worth of data with the RD200 compared to 5 years with the EQ100. That is not really a limitation with the RD200 since you can delete the readings on the device after you have downloaded then to the app.

We bought a house and discovered we have a radon problem using a Corentium radon detector we bought on Amazon. It works fine, but only gives a near term reading and a 7 day average reading, and it takes a full day before giving results. Based on the Corentium detector we hired a radon mitigation contractor who installed the typical plumbing and fan, and using his own detector, he measured safe results and declared victory. Enter Radon Eye. We put this device in the living area where we would spend time, and quickly discovered that the levels were way above the readings the contractor had found. When we confronted him, we learned he had put his meter in a different location, and since we wanted all the rooms to be safe we had him do additional work, after which we put his detector side by side with our Radon Eye. Both produced the same results and we found that his work did not get the job done. We would have been exposed to very unsafe levels (over 20) if we had just trusted him the first time around. This is a reminder that “ignorance is NOT bliss”. He came back several times and tried different things, and none were successful. So after “investing” over $2000 in someone who was not an expert, we searched for and found someone who runs his own company and is an expert. Whereas our original contractor would send in his laborers and stop in occasionally to tell them what to do and then leave, the second gentleman spent half a day with us, discovered that the work done by the previous contractor was incomplete and totally inadequate, redid it, and now our radon levels are well within the safe range. Had it not been for our Radon Eye and the capability it provided to fully verify and document results, we would have been exposed for long periods to very unsafe radon levels. So, needless to say, we love our Radon Eye detector. It works perfectly, requires no attention or maintenance, and it gives a reading very quickly. Moreover, the graphical presentation in my phone or tablet makes it very easy to verify that the radon level is staying at safe levels. It is not a stretch to declare that this device has saved lives.

A few days later: After running the new device for a few days, I could get the 1-day average which was much better in agreement with my older device, 0.81 vs 0.96. This is within 10%. The individual readings are quite different. Since they are not synchronized in time and could be as much as 5 minutes different, the fluctuations could be actual radon fluctuations over a period of a few minutes. Bottom line, use the 1-day average. 3 months later, I have purchased a third copy for another family member and have found the readings very different from the first two. This new device reads half the amount of radon 0.61 compared to 1.07 on an older device 3 inches away. This means that when the actual radon count is dangerous at 4, this new device will only be reading 2 (no action required). This almost factor of 2 discrepancies is in comparison to the lower of the original two devices. The bottom line is that I cannot recommend the Rapid Eye RD200 for reliable use in detecting radon. My advice, if you have one of these devices, is to calibrate it by getting a professional test for comparison and correct the future readings accordingly. I am reducing my rating to 3-stars based only on ease of use, not accuracy. If I can, I will return this particular device. Very disappointed. Basically, do not bother to buy these units until the manufacturer improves the calibration to within the stated 10%. I am removing 1 star because the stated 10% calibration accuracy is clearly wrong. My two units side-by-side have maintained an offset from each other of about 20%. This is disturbing since a sample of two units does not tell you much about the behavior of a large number of units. The spread could be worse. However, the relative measurements for any one unit, day by day, seem stable and its ability to detect changes in radon levels seems quite good. The manufacturer needs to do a better job calibrating the units other than just giving a certificate that states nothing factual about the particular unit. At a minimum, I would like to see a random sample of at least 10 units with the mean and standard deviation given. This is a South Korean made radon detector that is calibrated and well designed. The technology is the same as very expensive professional detectors. Setup is very easy including downloading the app and linking via Bluetooth with the detector. Data download is easy. The phone Bluetooth readout is solid with the first reading after 10 minutes and the first accurate running average reading after 1 hour. The device has its own data display that is clear. On the above ground floor, the device read 0.4 out of 4 and in the basement is reads 0.9 out of 4. The level 4 is the level at which action is necessary. Accuracy is stated within 10%. Long-term accuracy should be much better. I will come back to this review if there are problems. This appears to be a very good purchase compared to anything else in the consumer market. After 1 day, 2 of these side by side devices read 1 hour averages of 2.28 and 1.84 pCi/l. That is a little bit outside the 10% stated accuracy.

I own EcoSense RD200 and another popular radon detector. The RD200 has a larger detection chamber and is able to make more precise readings, faster. To their credit, both devices make the data available to hobbyists and 3rd party developers through a bluetooth API. While other device smears the data using a rolling smoothing function, the EcoSense RD200 publishes both raw and calibrated readings. In fact, you can follow along as it counts the individual scintillations, and visualize them in any way that delights your inner nerd. Estimated radon levels are published every 10 minutes, and improve with time. Radon levels in my location are quite variable by time of day, weather, etc. I am delighted to see these trends in near-real-time from the RadonEye, all the way down to the nitty-gritty of graphing the velocity of raw counts. The other device is only suitable for tracking longer-term averages, not hourly variations. I love this device and I will buy more over the holidays for family and friends. I commend EcoSense for making the data available over bluetooth. I encourage them to publish a document completely describing the bluetooth API, and perhaps publishing reference code.

This thing actually works great. Connects right to my phone, even from 2 floors away. One day it started to spike and I did some investigating, found out my radon stack was only 2in and we had an extreme cold spell and it froze. I have since replace with a 4in stack. You can see from the photo of when I disconnected the 2in stack

After much consideration, I decided on this unit over the other options that are available. I'm glad I did. This is truly a precision instrument that can give quick, accurate results as well as charting long term trends. We had a radon system installed in our house before we bought it earlier this year and I always wondered how well it was doing and if I really need to pay to have the fan running all the time. We're also trying to sell a house up in the mountains and was wanting to be proactive about the radon (so it wouldn't be a flag on the inspection). That's one of the reasons I liked this unit as it can give a reading within an hour. Since we are only up there to mow and maintain I wanted to get a reading while I was there. It immediately indicated a high reading... My next trip up there was about 8 days later. My first time to try the bluetooth download of the acquired data. Wow - was I shocked to see a peak reading above 40! Glad I wasn't puttering in the basement there that day (although we lived there for 4 years never thinking much about radon). Since the chart in the phone only shows hours I downloaded it to Excel and figured out how to convert it to dates using a formula. If you're interested, it's pretty easy to do. The data number is how may hours and the date on the file would be the last hour. Copy the data into a spreadsheet, remove the header rows and replace column 1 with this formula: =DATE(2018,10,3)-((497-ROW())/24) {where the date is the file save date and the 497 is whatever your data number is}. Make a line chart and you'll have what I pictured. Anyway, this told me that the peak I observed happened on Sept 16 - the date that hurricane Florence passed over our area. Well, there you go! I've since observed the ebb and flow of radon overnight in our house here. There are times even with the radon system installed that the level rises above the 4 threshold so I've experienced the warning beeps. Well done, it certainly lets you know but it only alerts for about 1 min every hour or so (don't know the exact timing). I'm also surprised how even opening a window just a little bit lowers the radon level extremely fast. Last comment about radon. I looked at the professional report from the remediator (we had a system installed in the mountain house) and it showed a period where the radon was 7 or 8 but only for a few hours. That is still considered passing since the average over 2 days was below the threshold. So this little instrument is still a good thing to have even if you have a remediation system installed as there will be times you should open a window if you are going to be in the basement.

There's radon in my basement. I've had it measured several times over the years, and we've always been just around the EPA action level of 4 pCi/L. I bought two Radon Eye monitors and have been using them for about 10-12 weeks. I chose this monitor from among the many available because it logs Rn concentration with hourly time resolution. The monitor itself (on the panel and via the app) has a 10 minute resolution. For the first few weeks, I located the monitors together in my basement, then moved one upstairs to my living room. While the monitors were located together, the hourly average concentrations agreed excellently; linear regression yielded a slope of 0.95, intercept of 0.15 pCi/L, and an R^2 of 0.94 over a Rn hourly concentration range of 0.4 to 8.7 pCi/L (average concentration, 4.0 pCi/L). Additionally, the Radon Eye average concentrations (over 2-4 days) agreed well with integrated tests done using either short term canister or electret reference methods. I've done only 9 of the integrated tests so far (because of the expense), but the Radon Eye average concentrations are 87% +/- 11% (range, 78% to 103%) of the reference integrated measurements. Please note: if the concentrations in my basement were much lower or had a smaller range, the relationships described above probably would not be quite as strong. Measurements are usually better when you are above the noise level. So here is my list of PROs (+) and CONs (-): (+) two units agree well with each other over a wide range of concentrations (+) average concentrations from both units compare well with integrated reference methods (+) instrument display panel shows 10 min concentration, hourly, daily... (+) smartphone app (bluetooth) allows viewing 10 minute and hourly concentrations plus graph (+) difficult to accidentally erase logged data but easy to clear memory intentionally (+) can log and export data in HOURLY average concentration using app (+) large capacity for storing data (+) comes with calibration certificate (FWIW) (+) cost! (-) records ONLY elapsed time in hours and not actual timestamp for reading :( (-) with app and bluetooth communication, must be fairly close to the monitor (estimate, 20 feet plus walls or floors), enabling wifi would be a BIG improvement! Overall, this is a very nice radon monitor. I've been quite impressed and would definitely recommend.