Review on Southwire M500CX4 Coax Continuity Tester/Mapper: Durable Design, Auto Power-Off, LED Display & 4 Color-Coded Remotes by Bam Reeder

I bought a small tester a few years ago and wasn't happy with it. This one from Southwire is a big improvement. The test button is now larger and much easier to press. The colored finials are snap fit and non-screw type, making them very easy to fit and remove from wall panels. Perhaps most importantly, unlike Klein and most other testers, the batteries are INTERCHANGEABLE. A very good unit.