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Old 13th Jul 2011, 12:22
  #702 (permalink)  
Salusa
 
Join Date: Aug 2006
Location: Hedge
Posts: 227
Received 23 Likes on 6 Posts
Use a handheld optic tachometer (Proptach) About $300 new.

Provided its calibrated of course.
Last edited by Salusa; 13th Jul 2011 at 12:32.
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