The RadonEye is an active radon gas monitor that has become increasingly popular for some years. Among consumer grade active radon monitors it is the most sensitive one. It is sold for a fair price and it is easy to operate via a Smartphone app through Bluetooth connection. This makes it useful for individual radon monitoring and for research in the framework of Citizen Science, for example in the context identifying radon priority areas, recording radon time series or measuring radon exhalation. If limitations are considered, it can be used in scientific research. In this paper its benefits and problems are reviewed and examples of its usage given.

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