"Use with 2 or 3 pair, RJ11/12 lines. Copper contacts have an angled edge to prevent alligator clips from falling off. Wire color coded for easy identification. Three 2-color LEDs identify activity. Complete with modular jack on the end."
Tests modular RJ11 or RJ12 lines
Test can be performed without disrupting circuit
Three 2 color LED's identify activity
Applications: Network installations, Cable maintenance and inspection, Field testing