19800-009 Buttset Harris TS19 Test Set, with Angled Bed-of-Nails Clips-Data Safe- High-Impedance Monitoring- Clip onto a line monitor mode without disrupting data traffic.-Safety clip on to monitor and trouble shoot phone lines-18 month warranty-Polarity indication: to identify polarity of the line-Audible ringer for callbacks-Tone and Pulse operation-For use with computerized voice response system-Speech signal levels compensated for loop length- Last number redial-Hearing aid compatible receiver-Replaceable heavy-duty braided line cord-Replaceable locking spring-loaded belt clip- HC19800009