Tests for shorts, opens, miswires and reversals. Tests EIA/TIA568A and 568B and 10Base-T Shield detection tests shield integrity. Tests installed wiring and jumper cables. âFâ connector for troubleshooting CAT5 coaxial installations. Tests for CAT5 opens and shorts. Tests CAT5 cable lengths from 3 to 600ft (0.9 to 183m)