 What is used as a CAT 5 tester? A CAT 5 tester can be a simple continuity tester where 8 lights confirm if the 8 cores, 4 pairs, have been terminated in the correct order. However, these testers give no feedback about the transmission capabilities of the cable. In addition, there is no feedback about the quality of installation and terminations of the ends. Therefore all data cabling should be tested with a cable certification tester such as a Fluke DSX. These types of testers show a chart of tests that show the performance of the cable and any effects of installation or poor terminations. Furthermore the actual effect on the cable and whether it is capable of transmitting as it should. A group of charts and calculations are given on a single page per cable and a summary green tick pass or red cross fail is noted.