The Armada Technologies PRO400 Graphical TDR/Tone Cable and Fault Locator is a handheld time domain reflectometer weighing only 12 ounces that is designed for identifying and locating faults on copper cables up to a distance of 3,000 feet for impedances below 25 ohms. For impedances above 25 ohms, the PRO400 is capable of distances up to 20,000 feet. The PRO400 injects a series of pulses into the cable under test. The velocity at which the pulses travel is determined by the type of cable which is known as the velocity of propagation (Vp) of the cable. By connecting the leads to the cable to test, a graphical display quickly and easily shows faults and 'events' on that cable.

Advanced signal processing techniques enable the PRO400 to find opens, short circuits, splices, taps, water ingress and other more elusive impedance mismatches. A built-in tone generator also provides a tone for wire tracing and identification. Furthermore, the PRO400 includes a backlit display, auto-off function, calibration of VOP from 20 to 99%, 4 cable impedence level options, a virtually zero dead zone, and water/dust protection. Selectable cable impedance matching, along with variable velocity factor, enables the PRO400 to be used to test all communication cables, including twisted pair and coaxial, with graphical results and fault distances displayed on a dot matrix LCD.

The TDR/Toner is housed in a tough, rugged ABS plastic molding, is water and dust-proof to IP54, and is supplied with test leads and a protective tool-belt holster. The PRO400 is designed and manufactured to international standards for quality, safety and reliability.