Both Chris Skull and me have obtained a sensor from KarmannGaz, Chris by sending KarmannGaz his own, partially completed, sensor and me by buying a sensor that KarmannGaz had left over.
Though a tad more expensive, a sensor could in theory also be built using a Raspberry, an Arduino-to-Raspberry shield, a radiation board and some other stuff (mainly the geiger counter), though KarmannGaz warned in the past on the Radioactive@Home forum that this built-your-own may not be able to communicate with the project (just as I have with connecting the Raspberry Pi -with SenseHat- to the various Quake Catcher Network projects) .
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