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Germán Carrillo's answer is the most convenient. A possible alternative (if you're stuck with QGIS 2.8) could be to:

• Use a string which allows the user to enter the units they want to use:

    ##units=string mm
  
    if units == 'mm':
        # Do something
    elif units == 'cm':
        # Do something
    elif units == 'm':
        # Do something
  

• Or use three boolean checkboxes:

    ##Millimeter=boolean
    ##Centimeter=boolean
    ##Meter=boolean
  
    if Millimeter == True:
        # Do something
    elif Centimeter == True:
        # Do something
    elif Meter == True:
        # Do something