Check it out. Electronic TDS meter for $0.72

did you guys/gals get the $10 off after putting in credit card info? i started to do this and it was showing $10.78 then below that I had to put in all my credit card info. at that point, not showing $10 off.
 
Me too! Have you guys used buy.com before? I've only used Amazon or direct with RC sponsor suppliers.
 
The TDS meter measures "total disolved solids" in water. It's a great tool to have to determine the effectivness of your R.O. system output. The lower reading the better. Most people have to run a D.I. cartridge to get to zero. It depends on where you live and what the water into your RO is. (tap water)
 
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