UEETEK Network Cable Tester LAN RJ45 RJ11 Cat 5 Ethernet Line Tool Internet Broadband Connection Speed Capability Test

Keep your network running smoothly by testing your cables to uncover problematic shorts, open.
Slow and fast switch and LED indicator shows malfunctions.
Can be used on RJ11, RJ12, 10 Base T and token ring cables.
Portable - Very easy to carry, comes with protective carrying case.
Requires one 9-volt battery (not included).