Eberline Model ASP-1 rneautron detector.
https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...718#post209758
https://www.homemadetools.net/forum/...059#post203180
https://www.homemadetools.net/forum/...491#post215620
https://www.homemadetools.net/forum/...896#post179397
https://www.homemadetools.net/forum/...482#post212159
