I don't mean to be a bummer, but if you still need to buy the solutions, how much different is this from a test kit (like ELOS for $13). It takes me 30 seconds to do a ALK test with a kit, and is much cheaper. 
 
Also a reputable LFS told me these were junk. I don't want to say names, for the sake of getting anyone in trouble. 
 
Just my 2 cents. 
 
But I would love to have a high-end MG probe and Ca probe...Willing to spend the money on these probes. Again only if there are no solutions involved, just dip and read. 
		
	
		
		
		
		
			
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite) 
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker 
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO) 
Type of Aquarium: mixed reef (SPS & LPS) with fish 
Dosing: Mg, Ca, Alk 
			 
		
		
		
		
	
		
		
	
	
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