Fluke Networks 50801001 TS44 PRO Telephone Test Set with Piercing Pin Clips Detects dial tone and polarity, places and receives calls, indicates line voltage and current, and has a 2-way speakerphone for hands-free conversation during testing of telephone lines DataSafe operation with superior high-impedance monitor Advanced testing functions for low/high voltage and low (mA) current Ergonomic DropSafe case (20-foot) Includes Data Lockout, Lockout Override and DSL/POTS filtering