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					Originally Posted by  Pie
					 
				 
				They were purchased at the same time, and they have sequential serial numbers. Same firmware & driver revisions, too.    
			
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 Hmmmm.  Any outside inputs into this thing or your software?  Temperature sensors?  Date/time input?
Are the outputs of the two the same on subsequent runs? i.e. Unit A always outputs 1.1 and unit B always outputs 1.11?