Get quick and easy diagnosis of open wires, shorted wires, crossed wires, and miswiring for almost any PC cable on the market (Serial ATA, RJ45, USB, IEEE-1394 FireWire(R), DB9, DB25, HD15)! We took the original PC Cable Tester and made it even better. The PC Cable Tester PRO ATA now supports the Serial ATA/High Speed Serialized AT Attachment, and also tests USB and FireWire for actual pin configurations.This stand-alone test device provides the user with a wire mapping display of standard PC data cables. The unique LED display clearly determines wiring status by providing a point-to-point pinout of the actual wiring configuration (LED glow-enhanced for printer cable test).This is an essential tool for cable dealers, cable assembly houses, IT professionals or system integrators to quickly troubleshoot PC data cables, the place where most data transmission problems occur. This handheld tool is lightweight, totally portable and works for automatic or manual scanning. Has DC battery compartment and AC power jack.