3-in-1 tester checks USOC, 568A &568B cables. Continuously-sequencing LED display provides instant identification of most wiring problems including shorts, opens, reversals and miswires.

This 3-in-1 tester has jacks for testing USOC, 568A and 568B cabling systems. Accurately verifies the continuity and sequence of 1-, 2-, 3-, and 4-pair voice and data channels. Operates on included 9V battery and features an auto-off to extend battery life. The two units conveniently snap together protecting the jacks. Protective carry case sold separately.