There are videos on the Internet showing that J305 tubes are very sensitive to UV rays. They literally go crazy under the influence of this type of radiation.
We conducted our own quick UV test of Geiger tubes J305 , which are supplied as an option with the Geiger counter module GGreg20_V3, and filmed a video.
Read the story and watch the video here::
iot-devices.com.ua/en/uv-test-of-the-j305-geiger-tubes/
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