Geiger counter test (SI-29 bg tube)
Geiger counter test with a russian SI-29 bg geiger tube Same of http://www.youtube.com/watch?v=AoKF_YOLQgQ but with a new orange front cover 
Working …
Geiger counter test with a russian SI-29 bg geiger tube Same of http://www.youtube.com/watch?v=AoKF_YOLQgQ but with a new orange front cover Working …