Based on the responses (which were really not what I was expecting), I 
perhaps need to better define what I am looking for, and ask a different 
question.

First of all, I should probably better define inexpensive.   Inexpensive 
in this case would be something in the low-three figure range...  Like 
around $200 or $250.  Maybe a bit more, and preferrably a bit less.  
Think about what you would pay for a good multimeter capable of 0.01% 
(or thereabouts) readings in DCV, that can be calibrated at a 
NIST-traceable lab.   Look at http://www.omega.com/pptst/HH40.html, for 
an example. 

Second, the fact that +-0.05*C is difficult really surprises me.   After 
all from -40*C to +60*C (the range I'm really looking at), this is only 
0.05% of full scale, or is only 1000 steps from -40*c to +60C, since 
+-0.05 corresponds to nearest 0.1C...  Is there a reason that it's so 
hard?  

What I am really looking for is something that is simple to use, and is 
accurate throughout it's range.  The purpose specifically being to 
verify the calibration of less accurate temperature sensors.   Or in 
other words, I really need something which I can trust means "0.5*C" 
when it says "0.5*C".

-forrest



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