DIY LAN CABLE TESTER

https://diy-projects4u.blogspot.com/2018/09/diy-lan-cable-tester.html?_sm_au_=iVVHnM6F3ZRkm6MH

Hardware

https://diy-projects4u.blogspot.com/2018/09/diy-lan-cable-tester.html?_sm_au_=iVVHnM6F3ZRkm6MH

via

Build Your Own LAN Cable Tester