Modifying the PDRM 82.

Brilliant! Thank you for posting this. I'm pretty sure my PDRM 82 is still functioning as it does read 0.0 after a few seconds of power on, but also it does the same when the whole GM tube is removed from the unit, which I thought was unexpected. I did expect it to fail when I removed the tube. With your documentation it gives me some scope for testing. Thanks!

ETA: I have also thrown every source I have at it, and it never reads more than 0.0...