Say goodbye to the tedious search for the right cable. With the CT-20 featuring an additional remote unit, you can identify cables without needing an extra person, even if they are installed in different rooms. In addition to cable identification, the correct polarity can also be determined. Of course, the CT-20 can also be used as a conventional continuity tester. The display on the CT-20 is both acoustic and visual, while the remote unit features a two-color LED. This professional tester is very robust, making it ideal for tough use. The remote unit is powered by the CT-20.