Allows cable makers to configure custom cables. The BB-25 will visually let you know the status of lines 2, 3, 4, 5, 6, 8, 20 & 22 on the DTE side by utilizing red/green bi-color LEDs. Provides signal status at a glance (four states: mark, space, clocking, and off). Complete cable “breakout” and reconfiguration exists with 24 in-line switches and 54 in-line machine tool sockets. Includes handy carrying case, 10 jumper wires and a device wiring chart. Cable extends 4” from side of tester. Connectors: 1 male DB25 & 1 female DB25.