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      Type 1 : RS-232 Serial Loop Back Tester, DB9 to DB25, Female to Female, 2 PCS/ Pack.

      Type 2 : RS-232 Serial Surge Protector (3MOV) DB25 to DB25, Male to Female, 1 PC/Pack.

      Type 3 : RS-232 Serial Mini Tester for Serial Port DB25 to DB25, Male to Female, 1 PC/Pack.

      Type 4 : RS-232 Serial Check Tester with Green/Red LED Indicator, DB25 to DB25, Male to Female, 1 PC/Pack. 

      Type 5 : RS-232 Serial Jumper Box DB25 to DB25, Male to Female, 1 PC/Pack. 

      5 products
      CompuCablePlusUSA.com Best RS-232 Serial Loop Back Tester DB9 Female to DB25 Female.
      RS-232 Serial Loop Back Tester DB9 to DB2, Female to Female, 2 PCS/Pack
      $30.00
      CompuCablePlusUSA.com Best RS-232 Serial Surge Protector (3MOV) DB25 Male to DB25 Female.
      RS-232 Serial Surge Protector (3MOV) DB25 to DB25, Male to Female, 1 PC/Pack.
      $15.00
      CompuCablePlusUSA.com Best RS-232 Serial Mini Tester for Serial Port DB25 Male to DB25 Female.
      RS-232 Serial Mini Tester for Serial Port DB25 to DB25, Male to Female, 1 PC/Pack.
      $22.68
      CompuCablePlusUSA.com Best RS-232 Serial Check Tester with Green/Red LED Indicator, DB25 Male to DB25 Female.
      RS-232 Serial Check Tester with Green/Red LED Indicator, DB25 to DB25, Male to Female, 1 PC/Pack.
      $22.68
      CompuCablePlusUSA.com Best RS-232 Jumper Box DB25 Male to DB25 Female with Jumper Wires.
      RS-232 Serial Jumper Box DB25 to DB25, Male to Female, 1 PC/Pack.
      $19.08