GQ GMC300EPlus Geiger Counting USB Radon Detector

Last updated: April 18, 2023


The small size makes this radon detector easy to carry around. It can auto-record data so you can compare levels over an extended period of time. The battery lasts and can be charged in the car or with a wall adapter.

We looked at the top Radon Detectors and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Radon Detector you should buy.

Product Details

Key Takeaway: This highly portable radon detector can be taken anywhere to get reliable readings.

In our analysis of 33 expert reviews, the GQ Geiger Counting USB Radon Detector placed 8th when we looked at the top 11 products in the category. For the full ranking, see below.

From The Manufacturer

GQ gmc-300e Plus is a newer GMC300EPlus Fulfill of gmc-300 Series Geiger counter. Compared to the previous model, gmc-300e Plus improved overall quality. It installed a high contrast black/white LCD module, added a front LED indicator/an audio data port. The audio data port can be directly connected to any third party device application as data input, such as iPad. It is designed to be a portable/convenient device. It has built in audible and visual signals for the level of radiation detected. It can be used for nuclear radiation detection and monitoring both indoor and outdoor, as well as in other similar environments. It features automatic data recording. It can continually monitor the radiation and log the data each second into internal memory. When connected to a PC, software can download the radiation history data to the computer and the user is able to analyze those data later. the device is equipped with an USB port, utilized for communication and external power supply/charging of the internal rechargeable battery. The GQ gmc-300e Plus internal rechargeable battery can be charged via a wall adapter or via a car charger through the car cigarette lighter. By using the adapters, continuous data monitoring is possible. Using either power adapter you will not have to worry about the batteries charge condition or any data loss. The main board also has a real time clock on board for time related data logging purposes. The USB port communicates with the GQ gmc-300 soft Geiger counter software and the GQ Geiger counter data viewer software. the GQ gmc-300 soft Geiger counter software’s appearance is an exact copy of the gmc-300 hardware human interface. You can download it for free and Explore the gmc-300 user interface before you purchase the real hardware. the GQ Geiger counter data viewer software can download the time stamped radiation (history) data from the unit and save it on a computer for future References analysis.

Expert Reviews


What reviewers liked

The audio signals indicate the harmful levels through the visual readings along with the audible alarm built-in.
It is really small and compact. One of our team carried it in his pants like a phone.
The device is powered by an internal rechargeable battery which lasts a decent amount of time and can be charged via a wall adapter or a car charger.
It can auto-record the data so easily permanently monitoring the levels of radiation and then stores the recorded data into the in-built memory.

What reviewers didn't like

The overall instructions aren’t clearly mentioned.
Built quality is not great.
View our Radon Detector buying guide for in-depth advice and recommendations.

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