These are a long plastic scintillators housed in a PVC container to be used outdoors as a truck monitor, or could be used for any other purpose. They can be driven by the Ludlum Model 3500-1000 RWM or Ludlum Model 3523 meter, or other meter. They come with the pre-amp installed.
These were purchased with a remote telemetry system and battery power system for use in remote areas. Let us know if you have any interest in these systems.