Telephone Test Set - 

TS25D is a test set. This telephone tester features data lockout and lockout override, and a large LCD. This feature-rich test set is a necessity for a variety of installs. The TS25D test set features data lockout and lockout override, making you completely safe in talk or monitor mode. The DSL/POTS filtering technology allows you to safely draw dial tone without downing DSL. A built-in analogue tone generator simplifies wire identification with a probe. An amplified speaker makes monitoring the line hands-free, so the user can keep working. The talk battery function provides voltage to carry voice conversation on non-powered pairs. All in a compact unit with an oversized, robust liquid crystal display (LCD) that makes the intuitive, common-sense menus easy to read and use.