This tester is pretty simple and cheap to build. All you need is 2x RJ45 Female connectors(like the ones for putting into the wall) 4x 2-pin Bi-color LEDs 4x 150 ohm resistor USB A Male Connector(I cut a USB Cord) 4x DPST or DPDT Switches A PCB Or floor tile and copper tape Some wire. …
Circuit Simulator