I purchased this simple cable tester and it did not come with any protective eclosure.
Simple fastening with M3x6 screws and nuts.
Cad files found in ONSHAPE
https://cad.onshape.com/documents/7a6270c52ae7d6ce0d7b95ea/w/1697fc9db686dd14eb3e11ad/e/63a339fcf92bff63cbe29547
https://a.co/d/6DOzGHv
The author marked this model as their own original creation.