how big of a difference is there between salt water test kits and the ones that can be used for both salt and fresh? The first kits I bought were the strips that you dip in the water and were for both fresh and salt the 2nd ones I bought were the drops and was also for both. There were some tests that were close and some that was a good amount off. What is recomended for test kits and do they give a better reading then these (they go in incriments like 0 - .25 - .5 - 3.0 - 6.0 )  is that fine or are there other ones that give a better reading?
thanks
Ray
								
								
				
			thanks
Ray

 
				

 
			
		
	
	
		 
			
		
	
	
		 
			
		
	
	
		 
			
		
	
	
		
