Fluke Networks 25501109 TS25D Telephone Test Set with Angled Bed-of-Nails Clips, Earpiece, 6-Wire In-line Modular Adapter, and Pouch Detects dial tone and polarity, places and receives calls, indicates line voltage and current, and has a one-way amplified speaker for hands-free listening during testing of telephone lines Built-in tone generator for wire identification Caller-ID and Call Waiting Caller-ID Monitors lines without disrupting service, remaining on hook if data is detected, and stores up to ten 23-digit numbers which can be speed-dialed via the keypad Keypad has standard dialing keys and function keys, plus a large LCD for viewing test status