MightyOhm.com

Thanks for your reply. I'm using the tube that came with the package. I gave it a shake, but heard no rattling. It is possible, I supposed, it could have been damaged in transit as I live in Melbourne. Anyway, the next thing I tried was increasing the voltage using the blue pot. As I said, my counte...

I assembled my geiger counter, and was happy to see it working right away. I was pleased to see that it worked immediately, and that I could leave the pot at its leftmost setting. However, now I'm a little worried. I get about 25 CPM, but a fair few of them are very quick double clicks or triple cli...