Compact unit for use with RS-232 communication
equipment. Comes with two DB9/25 pole adaptors – for
connection to portable computers.
• 102 LED display.
• Breakout and re-direction of all 25 lines.
• Four-state monitor on all signal lines on both DTE-DCE.
• 4 level bi-directional current loop test (4, 10, 20,
  60 mA).
• Ground potential difference test.
• Full information on CCITT and EIA signals and pin nos.
  on reverse of unit.
• Comes with 8 jumper wires, 30cm ribbon cable, 9V battery
  clip and two DB9/25 pole adaptors.