The Southwire M300P Professional VDV Cable Mapper is a high-quality cable testing tool designed for business and industrial use. This unit specifically tests RJ45 cables with precision and accuracy. Features including port covers to protect RJ45 and RJ11 ports from dust & debris, easy-to-read LCD display with backlight, built-in tone generator for cable tracing (separate amplifier probe required), etc.
Bought a while back and lost it on a job. Had to get the same one back. Very reliable and of good quality. Highly recommended for finding cable issues in networks.