I mean it's possible right? I've just never heard of calibrating a digital one before. Here is the exact one I have:
http://media.photobucket.com/image/digital hygrometer/mycigars/reviews/IMG_2372.jpg
	
		
			
		
		
	
				
			http://media.photobucket.com/image/digital hygrometer/mycigars/reviews/IMG_2372.jpg
			
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