1. 
   Wavemeter
   An electrical device for measuring the wavelength of a radio frequency (R.F.) wave either directly or indirectly, through the determination of the frequency.
   Found op http://www.mhs.ox.ac.uk/marconi/collection/glossary.php
   
   
2. 
   wavemeter
   device for determining the distance between successive wavefronts of equal phase along an electromagnetic wave. The determination is often made ...
   Found op http://www.britannica.com/eb/a-z/w/16
   
   

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