The Fluke Networks TS53-C-04 Test set performs voice and data testing for video technicians and communications service technicians all in one ruggedly built network tester. This portable telephone tester contains the latest RainSafe™, DropSafe™, and DataSafe™ technologies. It features voltage indication and measurement, data indication, current measurement, polarity and will detect dial tone. The TS53 butt set has glow-in-the-dark keys, extra large LCD screen and includes a Central Office (CO) 346A plug cord set.