It won't matter what temperature your water is at. 
1 drop of water will become the temperature of the instrument in a few seconds anyways. 
Put the ATC refractometer in the fridge, or out in the sun, and that 's what it will compensate temperature for. 
		
	
		
		
		
		
			
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				Mitch 
 
			 
		
		
		
		
	
		
		
	
	
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