The Meter-Comparator
MC4

These special demonstrator units are designed to promote energy-saving CFL and LED bulb usage by displaying, by means of an actual watthour meter, the relative changes in meter speed as the user switches from one bulb to the next.
      The unit measures 10-1/2" wide x 7" deep x 8-1/2" tall (without bulbs)
               and can be plugged into any standard 110/120 V outlet.
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