Self-Contained XLR Cable Tester with LEDs on Top The RapcoHorizon CDBLOX Balanced XLR Cable Tester is used to test XLR cables. RapcoHorizon Tester Series BLOX RapcoHorizon Tester BLOX are a series of testing devices for virtually any cable testing situation. Including a 1/4" cable tester, an XLR cable tester, a Speak-On cable tester and even a continuity tester with probes to test continuity from any 2 points on any system. Built in our standard BLOX chassis, for portability and rugged, reliable service. Features: Self-contained XLR cable tester Both lights on indicates a good cable XLR male and female connectors Easily fits into your toolbox or even a shirt pocket Black, powder-coated aluminum chassis Hand-soldered connectors Specifications: Approximate size: 3 1/2" x 1 1/4" x 1" (2) LED - Red LED (1) XLRF - XLR female panel mount (1) XLRM - XLR Male panel mount