THE COMTEST 100DLX TESTS BOTH DB9 AND DB25 INTERFACES, HIGHER SPEEDS AND LOWER VOLTAGES. IT COMBINES THE ADVANTAGES OF A LINE AND BATTERY POWERED RS232 BREAKOUT BOX. 
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Easily carried around, the Comtest 100DLX is a time and trouble-saving tool for engineers, computer salesmen and those who install, repair and use RS-232 communication equipment. It was constructed by field service engineers and famous for its convenience in use and reliability. It can convert between DB9 and DB25 interfaces, necessary for those working with portable computers.
 

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