dual trade

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Senior Member
Hi Everyone
In the sentence :

"Troubleshooting requires the use of a dual trade ( or two channel) oscilloscope "
This is all the context I have , what is " a dual trade "?
It has nothing to do with commerce!!
  • cute angel

    Senior Member
    the universe
    I think it has no relation to trade we know that this oscilloscope is used to measure the الجهد العضلي or something like that so it's an oscilloscope with مدخلين .
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