welcome back....! another kick! this is equipment has selenium 75, and its used (also) on aircraft inspection , for inspecting the rotors.

https://www.ebay.com/itm/Du-Pont-NDT-Composite-Laminate-Tester-thickness-p-n-4SE01642-Aircraft-Test-Equip/142046149534?epid=664597950&hash=item21129c3b9e:g:~kIAAOSwJMhXD7NE

https://www.ebay.com/…/Du-Pont-NDT-Composite-…/142046149534…

Du Pont NDT Composite Laminate Tester thickness p/n 4SE01642 Aircraft Test Equip | eBay

Here is a very High quality Composite Laminate Tester in unknown working condition. Being sold as-is/as found. g4shelffor inventory . | eBay!

EBAY.COM