TS52 PRO test set with ABN/PP and RJ11 plug Test Functions: Data Indication, Voltage Indication, Current (mA) Indication, Caller-ID, DTMF Digit Grabbing Backlit LCD display and glow in the dark keypad Superior high-impedance monitoring, lockout, and override Passes 20 foot drop test DSL/POTS Filtering Technology allows technicians to clip on a live DSL line to test POTS service without downing or distrupting data service Designed for use in rainy conditions 2-way hands-free speakerphone