#digital_voltmeter__digitalvoltmeter  an electronic voltmeter that gives readings in digits
  supertype:  electronic_voltmeter  a voltmeter whose sensitivity is increased by amplification
  part:  digital_display__digitaldisplay__alphanumeric_display  a display that gives the information in the form of characters (numbers or letters)
     part:  light-emitting_diode__LED  diode such that light emitted at a p-n junction is proportional to the bias current; color depends on the material used

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Another search (with same display options)?