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Tetra GH kit

George wrote:
> Get a Tetra Hardness test kit with KH and GH tests.  The GH value is what
> is used by most aquarium books when they say a fish or plant likes hard or
> soft water.  GH is the measure of calcium and magnesium in the water and
> does NOT
> affect pH.  The KH value refers to the amount of buffering in the water and
> DOES affect pH.  
Where do you buy the Tetra GH kit from, George?  I have/like the KH kit
but have never found the GH kit anywhere.  Is there a mail order place
that sells it?  Anyone?