DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Digital Multimeter
   DMM
      <electronics> (DMM) A peice of test equipment used for
      measuring voltage, current, resistance, and possibly other
      electircal quantities and displaying the value in number form.
      (1997-02-12)