Klein Tools VDV501-823 VDV Scout Pro 2 Network Cable Tester is an advanced cable tester for voice, data and video cables including RJ11/12, data RJ45 and video F-connector coax. The Klein Tools VDV501-825 tests for common fault types including tests for open, short, miswire or split-pair faults, has a built-in tone generator, and includes an active Test-n-Map remote that enables single-step testing mapping, and ID.