Progressive Electronics Inc. Modular Cable Tester

• Tests 258, T568A, T568B, 10BaseT, and USOC
• Built-in tone generator

Designed to test cables terminating with RJ-45. It cycles through each pair combination continuously and will identify opens, shorts, reversals, and transposed pairs. Tester will even alert the user if it's connected to an active circuit without harming the unit. A tone is placed on each pair and can be picked up at the far end of cable with any inductive amplifier. Battery sold separately.