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Snap-On has a calibration service for their wrenches, and I assume that any
quality producer would have the same or at least be able to tell you where
to have it done.  A good indication of quality is probably whether the
manufacturer can help you with this matter.

Bill Bartlett's home test method is OK, but I would suggest the following
modifications:
1.  take a piece of flat stock (about .0625" x ,75") 21 inches long and    
drill a hole in the middle for any convienent bolt size.  Make sure     the
bar is balanced on the hole.  Cut a notch on the bar 10" from     the
center.
2.  set the wrench to the desired value and put it in a vise (putting      
the square drive into the vise adds the error of wrench weight).
3.  using a bolt and socket, put the bar on the wrench horizontally (+-    
5° is probably enough - the error is .38%).
4.  hang your bucket on the 10" notch with 90 t0 95% of the desired    
value ( with the 10" arm this is easy - 50 in/lb/10 * ,9 = 4,5lb.).
5.  add water to the bucket until the wrench clicks.
6.  weigh the bucket and multiply by 10.
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Please send your photos and drawings to marvkaye@olsusa.com.
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