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					Originally Posted by JHG
					
				 
				I used to use mine with my freshwater tanks but need to buy some calibration solution to calibrate it for use on the marine tanks. 
 
 
J 
			
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 Just use distilled water and sett refractometer to 0.    
		
	
		
		
		
		
			
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				Gary 
  
  
CAN'T WE ALL JUST GET A BONG!?! 
  
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