KKmoon Assembled DIY Geiger Counter Kit Module Nuclear Radiation Detector

When connected to power this clicks very infrequently and seems far less sensitive than other Geiger counters I have used. I suppose it's to do with the tube used but as there are no instructions whatsoever I don't know if I could adjust the voltage to increase sensitivity. (If I understand Geiger Mueller tubes correctly they either strike or not, so probably not possible to adjust). I do have test sources in particular gas lamp mantles and these make it click a bit but as I say I wouldn't want to trust my life to this unit. Really disappointed.

Seems to work as advertised. Detects the harmless background radiation. I don't have any bigger sources to check so I'm not sure how sensitive it is.One thing to be weary of is that the geiger tube is barely long enough to slot into the slots on the board. It looks like the tube should be 5mm longer in order to have a more snug fit. Hence the 4 stars instead of 5. So if you're planning on moving this thing around a lot it may slide out. So far it hasn't though.

Connected it directly to an interrupt pin on an ESP32 and now I have a random number generator.

Operated okLack of documentation e.g. Calibration informationEventually received this after contacting vendor

Rubbish. Tube doesn’t fit board connectors as they’re too wide apart. Zero instructions and a QR that doesn’t work. Checking their website gives zero results. I don’t even know what voltage is required let alone how it actually works.