Kibeland Handhled Multi Function Cable Tester with 8 Remote Adaptor RJ45 RJ11 BNC USB Network Telephone Wire Tracker Cable Length Tester

Worked great while it lasted but after almost a year it's absolutely dead. Screen went blank and I thought it was low battery so I bought a new pack of battery and it doesn't power on. Tested the batteries and they are good. I used to even take the battery out to avoid corrosion. Left me high and dry on a job. Luckily I had another tester to test cable map but I relied on this for toning cables connected to a switch. I now realize I need to always have more than one of these things.