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After reading other reviews, I noticed some comments about discrepancies in readings compared to similar sensors. Because of that, I purchased another sensor from Aranet. The Aranet is much more expensive (almost 4.5 times more!) and has many functions I don’t need, but it also has a strong reputation.
At the beginning, the GQ device showed lower radon numbers than the Aranet, but they were always in the same category. For example, when the Aranet showed radon levels in the “green” zone, the GQ device also showed “green.” When the Aranet displayed “red,” the GQ displayed “red” as well. However, the exact numerical values were different on the two displays.
Initially, I tested the devices for about a day and a few hours. The numbers were different, but both devices showed the same zones—first “yellow,” then “red” after a few hours. I ventilated the room, and the radon level dropped back to the “green” zone on both devices.
I contacted GQ customer service. They told me that updates had been implemented to the device since the end of 2025, improving its accuracy. They also recommended testing the area over an extended period.
It’s important to remember that official guidance from the government Health Department for lab test kits recommends 100 days of testing. I had only tested for about 1.5 days. On the same day, I turned the basement ventilation to maximum, and the radon level dropped to the bottom of the green range.
After three days of testing, the readings from both devices were within a close range. The numbers change when I move the devices around the house, but they move together and stay in the same zones.
I’m really happy that I was able to identify the high radon level quickly and fix the issue easily. I do wish the GQ device came with some type of certificate from an independent, reputable lab—something like: “Tested and calibrated. Reading accuracy verified. Deviation +/- 10%.” I would be willing to pay more for that kind of certification. In my opinion, there is room for a slight price increase if it provides an additional layer of assurance that the displayed numbers are accurate.
I also like the design and the fact that the base has many ventilation holes. Since it measures gas, it should have good airflow to the sensor. I don’t understand why some similar detectors have almost no openings for air circulation.
Summary: A well-built, nicely designed product at a very reasonable price. The company could improve by providing stronger assurance of reading accuracy. Overall, it works fine at the end of the day.
P.S. Dear purchasers and project leaders at GQ: could you please change the black charging cable to a white one? The charger is white, the base is white—so why include a black cable? I ended up finding my own white cable to match.
