DB25 Male to Female Loopback Tester 4-LED
DB25 Serial RS232 Loopback Tester with Diagnostic LEDs
This Serial Loop Back Tester allows you to diagnose any problems with your DB25 port or DB25 serial cable. It has diagnostic LEDs for TD / RD, RTS / CTS, DSR/DTR, and TC/RC connections.
Connectors: DB25 Male to Female