Thexton's Extended Electrical Back Probe Kit, No. 490X, allows the technician to back probe connectors easily without having to remove the terminal. The extension wire makes it easier to test in difficult to reach locations. The 490X contains eight extended electrical backprobes in four different colors. These backprobes are used to access electrical circuits from the back side of the connector. The extension wire allows the technician to access connectors that are tucked away, and makes testing connectors more convenient.